The thickness of a plano-convex glass lens in the middle is 1.5 cm. Viewing from the flat side the thickness of the lens at the centre will appear (refractive index of glass is 1.5) to be

1.  1.5 cm

2.  1.0 cm

3.  2 cm

4.  0.5 cm

Subtopic:  Lenses |
 68%
From NCERT
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A ray of light incident on an equilateral prism at an angle of incidence i. The deviation produced by prism will be maximum when angle i is [take μglass=2]

(1) 30°

(2) 45°

(3) 60°

(4) 90°

Subtopic:  Prisms |
 56%
From NCERT
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A lens of focal length \(f_{a}\) in air consists of a glass of refractive index \(\mu_{g}.\) If \(f_{l}\) is its focal length in a liquid of refractive index \(\mu_{l},\) then for \(\mu_{l}=\mu_{g}\)
1. \(f_{l}=0\)
2. \(\infty >f_{l}>f_{a}\)
3. \(0<f_{l}<f_{a}\)
4. \(f_{l}=\infty \)

Subtopic:  Lens Makers' Formula |
 68%
From NCERT
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If four convex lenses, given to you have focal lengths f1<f2<f3<f4, then which of the following combination will you prefer to form a compound microscope?

(1) f1 as objective and f4 as eye-lens

(2) f1 as objective and f2 as eye-lens

(3) f4 as objective and f1 as eye-lens

(4) f2 as objective and f3 as eye-lens

Subtopic:  Simple & Compound Microscope |
From NCERT
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A light ray is incident on a prism of refracting angle 30°. The refractive index of prism is 2, then for what value of angle of incidence, the ray will retrace its path?

1.  30°

2.  45°

3.  37°

4.  60°

 

 

Subtopic:  Prisms |
 85%
From NCERT
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The ratio of the velocity of light in a medium to the velocity of light in a vacuum is 45. If the ray of light is emerging from this medium into the air, then the critical angle for this interface of medium and air will be:

(1) 30°

(2) 37°

(3) 53°

(4) 45°

Subtopic:  Total Internal Reflection |
 81%
From NCERT
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If light ray is incident normally on face AB of a part of a prism, then for no emergent ray from second face AC [μrefractive index of glass of prism]

(1) μ=23

(2) μ>23

(3) μ<23

(4) μ can have any value

Subtopic:  Prisms |
 72%
From NCERT
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A plane mirror is fixed in YZ-plane at x = 0. The velocity of a moving object is v0=3i^+6j^+4k^. The velocity of the image relative to a stationary observer will be:

1.  3i^-6j^-4k^

2.  3i^-6j^+4k^

3.  -3i^+6j^+4k^

4.  -3i^-6j^-4k^

Subtopic:  Reflection at Plane Surface |
 64%
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If there is no emergent light through a prism of refracting angle \(60^{\circ},\) whatever may be the angle of incidence, then the minimum value of the refractive index of the material of the prism is:

1.  2

2.  2

3.  1.5

4.  3

Subtopic:  Prisms |
 52%
From NCERT
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If the space between two convex lenses of glass in the combination shown in the figure below is filled with water, then

1.  The focal length of the system will decrease

2.  The focal length of the system will increase

3.  Power of the system will increase

4.  Power of the system will become infinite  

Subtopic:  Lenses |
 65%
From NCERT
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