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Physics-

General

Easy

Question

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface of water, the radius of the circle in centimeter is

$12 \times 3 \times \sqrt{5}$
$\frac{12 \times 3}{\sqrt{5}}$
$12 \times 3 \times \sqrt{7}$
$\frac{12 \times 3}{\sqrt{7}}$ .

The correct answer is: $fraction numerator 12 cross times 3 over denominator square root of 7 end fraction$ .

Related Questions to study

Consider the situation shown in figure. Water (m_w = 4/3) is filled in a beaker upto a height of 10 cm. A plane mirror is fixed at a height of 5 cm from the surface of water. Distance of image from the mirror after reflection from the mirror after reflection from it of an object O at the bottom of the beaker is

Consider the situation shown in figure. Water (m_w = 4/3) is filled in a beaker upto a height of 10 cm. A plane mirror is fixed at a height of 5 cm from the surface of water. Distance of image from the mirror after reflection from the mirror after reflection from it of an object O at the bottom of the beaker is

physics-General

One side of a glass slab is silvered as shown in figure. A ray of light is incident on the other side at angle of incidence i = 45º. Refractive index of glass is given as 1.5. The deviation of the ray of light from its initial path when it comes out of the slab is

One side of a glass slab is silvered as shown in figure. A ray of light is incident on the other side at angle of incidence i = 45º. Refractive index of glass is given as 1.5. The deviation of the ray of light from its initial path when it comes out of the slab is

physics-General

Consider the following diagram The incident ray parallel to the optical axis passing through

Consider the following diagram The incident ray parallel to the optical axis passing through

physics-General

parallel

A layered lens as shown in the figure is made of two materials indicated by different shades. A point object is placed on its axis. The lens will form.

A layered lens as shown in the figure is made of two materials indicated by different shades. A point object is placed on its axis. The lens will form.

physics-General

A prism of refractive index $open parentheses fraction numerator 3 over denominator 2 end fraction close parentheses$ is immersed in water of refractive index $open parentheses fraction numerator 4 over denominator 3 end fraction close parentheses$ . For the total internal reflection the correct choice is

A prism of refractive index $open parentheses fraction numerator 3 over denominator 2 end fraction close parentheses$ is immersed in water of refractive index $open parentheses fraction numerator 4 over denominator 3 end fraction close parentheses$ . For the total internal reflection the correct choice is

physics-General

For a prism PQR the incident and emergent rays are parallel. The minimum value of refractive index of the prism material is

For a prism PQR the incident and emergent rays are parallel. The minimum value of refractive index of the prism material is

physics-General

parallel

When the prism is in the minimum deviation position (Figure). Choose the correct one.

When the prism is in the minimum deviation position (Figure). Choose the correct one.

physics-General

Figure shows a cross - section of light pipe made of glass fibre of refractive index 1.68. The outer coating of the pipe is made of a material of refractive index 1.44. What is the range of angles of the incident rays with the axis of the pipe for which total internal reflection inside the pipe takes place ?

Figure shows a cross - section of light pipe made of glass fibre of refractive index 1.68. The outer coating of the pipe is made of a material of refractive index 1.44. What is the range of angles of the incident rays with the axis of the pipe for which total internal reflection inside the pipe takes place ?

physics-General

A vessel contains a slab of glass 8cm thick and of refractive index 1.6 over the slab, the vessel is filled by oil of refractive index m upto height 4.5 cm and also by another liquid i.e., water of refractive index $fraction numerator 4 over denominator 3 end fraction$ and height 6cm as shown in figure. An observer looking down from above, observes that, a mark at the bottom of the glass slab appears to be raised up to position 6cm from the bottom of the slab. The refractive index of the oil is

A vessel contains a slab of glass 8cm thick and of refractive index 1.6 over the slab, the vessel is filled by oil of refractive index m upto height 4.5 cm and also by another liquid i.e., water of refractive index $fraction numerator 4 over denominator 3 end fraction$ and height 6cm as shown in figure. An observer looking down from above, observes that, a mark at the bottom of the glass slab appears to be raised up to position 6cm from the bottom of the slab. The refractive index of the oil is

physics-General

parallel

In the Figure, AB and BK represent incident and reflected rays. If angle BCF = 35º. Then $angle B F P$ . will be equal to ____ degrees

In the Figure, AB and BK represent incident and reflected rays. If angle BCF = 35º. Then $angle B F P$ . will be equal to ____ degrees

physics-General

Assertion : The net deviation suffered by a light ray incident on a plane mirror as shown in the figure is $360 degree minus 2 cross times 30 degree equals 300 degree$
Reason : A ray of light is incident on a plane mirror at an angle i with the normal to the mirror. It strikes another plane mirror inclined at an angle $theta$ with the first mirror. It is given that $i less than theta.$ The net deviation produced after reflection once from each mirror is $2 pi minus 2 theta$ .
A) If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.
C) If Assertion is true but Reason is false.
D) If Assertion is false but Reason is true.

Assertion : The net deviation suffered by a light ray incident on a plane mirror as shown in the figure is $360 degree minus 2 cross times 30 degree equals 300 degree$
Reason : A ray of light is incident on a plane mirror at an angle i with the normal to the mirror. It strikes another plane mirror inclined at an angle $theta$ with the first mirror. It is given that $i less than theta.$ The net deviation produced after reflection once from each mirror is $2 pi minus 2 theta$ .
A) If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.
C) If Assertion is true but Reason is false.
D) If Assertion is false but Reason is true.

physics-General

Assertion : In YDSE number of bridge figure or dark fringe can not be unlimited
Reason : In YDSE path difference between the superposing waves can not be more than the distance between the slits.
A) If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.
C) If Assertion is true but Reason is false.
D) If Assertion is false but Reason is true.

Assertion : In YDSE number of bridge figure or dark fringe can not be unlimited
Reason : In YDSE path difference between the superposing waves can not be more than the distance between the slits.
A) If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.
C) If Assertion is true but Reason is false.
D) If Assertion is false but Reason is true.

physics-General

parallel

Assertion : A beam of light containing radiations of only two wavelengths is incident on a prism. It is found that radiations of one wavelength come out from the face AC of the prism but radiations of other wavelength does not.
Reason : The condition of total internal reflection is satisfied for one wavelength and not for other.
A) If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.
C) If Assertion is true but Reason is false.
D) If Assertion is false but Reason is true.

Assertion : A beam of light containing radiations of only two wavelengths is incident on a prism. It is found that radiations of one wavelength come out from the face AC of the prism but radiations of other wavelength does not.
Reason : The condition of total internal reflection is satisfied for one wavelength and not for other.
A) If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.
C) If Assertion is true but Reason is false.
D) If Assertion is false but Reason is true.

physics-General

In an interference arrangement similar to Young's double – slit experiment, the slits $S subscript 1 end subscript$ and $S subscript 2 end subscript$ are illuminated with coherent microwave sources, each of frequency $1 0 to the power of 6 end exponent H z.$ The sources are synchronized to have zero phase difference. The slits are separated by a distance $d equals 150.0 m.$ The intensity $l open parentheses theta close parentheses$ is measured as a function of $theta comma$ where $theta$ is defined as shown. If $l subscript 0 end subscript$ is the maximum intensity, then $l open parentheses theta close parentheses$ for $0 greater or equal than theta less or equal than 90 degree$ is given by

In an interference arrangement similar to Young's double – slit experiment, the slits $S subscript 1 end subscript$ and $S subscript 2 end subscript$ are illuminated with coherent microwave sources, each of frequency $1 0 to the power of 6 end exponent H z.$ The sources are synchronized to have zero phase difference. The slits are separated by a distance $d equals 150.0 m.$ The intensity $l open parentheses theta close parentheses$ is measured as a function of $theta comma$ where $theta$ is defined as shown. If $l subscript 0 end subscript$ is the maximum intensity, then $l open parentheses theta close parentheses$ for $0 greater or equal than theta less or equal than 90 degree$ is given by

physics-General

In an interference arrangement, similar to Young's double slit experiment, the slits $S l 1$ and $S subscript 2 end subscript$ are illuminated with coherent microwave sources, each of frequency $106$ Hz. The sources are syn necrotized to have zero phase difference. The slits are separated by distance $d equals 150 m.$ The intensity $l subscript open parentheses theta close parentheses end subscript$ is measured as a function of $theta comma$ where $theta$ is defined as shown in figure. If $l subscript 0 end subscript$ is maximum intensity, then $l subscript open parentheses theta close parentheses end subscript$ for $0 less or equal than theta less or equal than 90$ is given by

In an interference arrangement, similar to Young's double slit experiment, the slits $S l 1$ and $S subscript 2 end subscript$ are illuminated with coherent microwave sources, each of frequency $106$ Hz. The sources are syn necrotized to have zero phase difference. The slits are separated by distance $d equals 150 m.$ The intensity $l subscript open parentheses theta close parentheses end subscript$ is measured as a function of $theta comma$ where $theta$ is defined as shown in figure. If $l subscript 0 end subscript$ is maximum intensity, then $l subscript open parentheses theta close parentheses end subscript$ for $0 less or equal than theta less or equal than 90$ is given by

physics-General

parallel

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