Physics-
General
Easy
Question
In the given figure a plano-concave lens is placed on a paper on which a flower is drawn. How far above its actual position does the flower appear to be ?
- 10 cm
- 15 cm
- 50 cm
- none of these
The correct answer is: 10 cm
Considering refraction at the curved surface
Related Questions to study
physics-
A prism having an apex angle of 40 and refractive index of 1.50 is located in front of a vertical plane mirror as shown in the figure. A horizontal ray of light is incident on the prism. The total angle through which the ray is deviated is:
A prism having an apex angle of 40 and refractive index of 1.50 is located in front of a vertical plane mirror as shown in the figure. A horizontal ray of light is incident on the prism. The total angle through which the ray is deviated is:
physics-General
physics-
Given that, velocity of light in quartz = 
m/s and velocity of light in glycerine = 
. Now a slab made of quartz is placed in glycerine as shown. The shift of the object produced by slab is
Given that, velocity of light in quartz = m/s and velocity of light in glycerine = . Now a slab made of quartz is placed in glycerine as shown. The shift of the object produced by slab is
physics-General
physics-
A beam of light is converging towards a point. A plane parallel plate of glass of thickness t, refractive index m is introduced in the path of the beam as shown in the figure. The convergent point is shifted by (assume near normal incidence):
A beam of light is converging towards a point. A plane parallel plate of glass of thickness t, refractive index m is introduced in the path of the beam as shown in the figure. The convergent point is shifted by (assume near normal incidence):
physics-General
physics-
AZ ray of light travelling in air is incident at grazing incidence on a slab with variable refractive index 
where 
and follows path as shown in the figure. What is the total deviation produced by slab when the ray comes out
AZ ray of light travelling in air is incident at grazing incidence on a slab with variable refractive index where and follows path as shown in the figure. What is the total deviation produced by slab when the ray comes out
physics-General
physics-
In the figure shown find the total magnification after two successive reflections first on 
and then on 
.
In the figure shown find the total magnification after two successive reflections first on and then on .
physics-General
physics-
A square ABCD of side 1mm is kept at distance 15 cm infront of the concave mirror as shown in the figure. The focal length of the mirror is 10 cm. The length of the perimeter of its image will be (nearly):
A square ABCD of side 1mm is kept at distance 15 cm infront of the concave mirror as shown in the figure. The focal length of the mirror is 10 cm. The length of the perimeter of its image will be (nearly):
physics-General
physics-
Two mirrors are inclined at an angle q as shown in the figure. Light ray is incident parallel to one of the mirrors. Light will start retracing its path after third reflection if
Two mirrors are inclined at an angle q as shown in the figure. Light ray is incident parallel to one of the mirrors. Light will start retracing its path after third reflection if
physics-General
physics-
A steady current 4 A flows in an inductor coil when connected to a 12 V dc source as shown in figure 1. If the same coil is connected to an ac source of 12 V, 50 rad/s, a current of 2.4 A flows in the circuit as shown in figure 2. Now after these observations, a capacitor of capacitance 
is connected in series with the coil and with the same AC source as shown in figure 3 :
The average power supplied to the circuit after connecting capacitance in series is approximately equal to:
A steady current 4 A flows in an inductor coil when connected to a 12 V dc source as shown in figure 1. If the same coil is connected to an ac source of 12 V, 50 rad/s, a current of 2.4 A flows in the circuit as shown in figure 2. Now after these observations, a capacitor of capacitance is connected in series with the coil and with the same AC source as shown in figure 3 :
The average power supplied to the circuit after connecting capacitance in series is approximately equal to:
physics-General
physics-
A steady current 4 A flows in an inductor coil when connected to a 12 V dc source as shown in figure 1. If the same coil is connected to an ac source of 12 V, 50 rad/s, a current of 2.4 A flows in the circuit as shown in figure 2. Now after these observations, a capacitor of capacitance is connected in series with the coil and with the same AC source as shown in figure 3 :
The resistance of the coil is :
A steady current 4 A flows in an inductor coil when connected to a 12 V dc source as shown in figure 1. If the same coil is connected to an ac source of 12 V, 50 rad/s, a current of 2.4 A flows in the circuit as shown in figure 2. Now after these observations, a capacitor of capacitance is connected in series with the coil and with the same AC source as shown in figure 3 :
The resistance of the coil is :
physics-General
physics-
A steady current 4 A flows in an inductor coil when connected to a 12 V dc source as shown in figure 1. If the same coil is connected to an ac source of 12 V, 50 rad/s, a current of 2.4 A flows in the circuit as shown in figure 2. Now after these observations, a capacitor of capacitance is connected in series with the coil and with the same AC source as shown in figure 3 :
The inductance of the coil is nearly equal to
A steady current 4 A flows in an inductor coil when connected to a 12 V dc source as shown in figure 1. If the same coil is connected to an ac source of 12 V, 50 rad/s, a current of 2.4 A flows in the circuit as shown in figure 2. Now after these observations, a capacitor of capacitance is connected in series with the coil and with the same AC source as shown in figure 3 :
The inductance of the coil is nearly equal to
physics-General
physics-
Statement-1 : In a series R,L,C circuit if 
, 
, and 
denote rms voltage across R, L and C respectively and VS is the rms voltage across the source, then 
.
Statement-2 : In AC circuits, kirchoff voltage law is correct at every instant of time.
Statement-1 : In a series R,L,C circuit if , , and denote rms voltage across R, L and C respectively and VS is the rms voltage across the source, then .
Statement-2 : In AC circuits, kirchoff voltage law is correct at every instant of time.
physics-General
physics-
What is the amount of power delivered by the ac source in the circuit shown (in watts)
What is the amount of power delivered by the ac source in the circuit shown (in watts)
physics-General
physics-
In the circuit diagram shown, 
. The effective current through the source is:
In the circuit diagram shown, . The effective current through the source is:
physics-General
physics-
The voltage time (V - t) graph for triangular wave having peak value. 
is as shown in figure The rms value of V in time interval from t = 0 to 
is
The voltage time (V - t) graph for triangular wave having peak value. is as shown in figure The rms value of V in time interval from t = 0 to is
physics-General
physics-
In a black box of unknown elements (L, C or R or any other combination) an AC voltage 
is applied and current in the circuit was found to be 
. Then the unknown elements in the box may be :
In a black box of unknown elements (L, C or R or any other combination) an AC voltage is applied and current in the circuit was found to be . Then the unknown elements in the box may be :
physics-General
