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

  1. 12 cross times 3 cross times square root of 5    
  2. fraction numerator 12 cross times 3 over denominator square root of 5 end fraction    
  3. 12 cross times 3 cross times square root of 7    
  4. fraction numerator 12 cross times 3 over denominator square root of 7 end fraction.    

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

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Consider the situation shown in figure. Water (mw = 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 (mw = 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

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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

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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

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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 ?

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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

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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

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physics-General
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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
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physics-General
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Assertion : In YDSE number of bridge figure or dark fringe can not be unlimited
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physics-General
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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.
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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.
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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.
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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.

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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 thetais 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 degreeis 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 thetais 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 degreeis given by

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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
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