Two convex lenses of focal lengths 10 cm and 30 cm are kept at a separation of 20 cm. Then the correct statement is:

(1) The effective focal length is 15 cm

(2) Chromatic aberration is minimized

(3) Combination behaves like a convergent lens 

(4) All of these

Subtopic:  Lenses |
 82%
From NCERT
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If one surface of a biconvex lens is silvered, then it behaves as

(1) A concave mirror of focal length R4μ-2

(2) A concave mirror of focal length R2μ

(3) A convex mirror of focal length R4μ-2

(4) A concave mirror of focal length R2μ-2

Subtopic:  Lenses |
 54%
From NCERT
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An astronomical telescope has an angular magnification of 20 in its normal adjustment. The focal length of the eyepiece is 4 cm. Distance between objective and eyepiece is:

1.  80 cm

2. 84 cm

3.  76 cm

4.  90 cm

Subtopic:  Telescope |
 81%
From NCERT
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A liquid of refractive index 43 is placed between two identical planoconvex-lenses touching each other at their spherical surfaces of radius R. If the refractive index of the lens is 1.50, then the lens behaves as:

1. a convergent with power \(\mathrm{P}=\frac{1}{3 R}\)
2. a convergent with power \(\mathrm{P}=\frac{1}{6 R}\)
3. a divergent with power \(\mathrm{P}=\frac{1}{3 R}\)
4. a divergent with power \(\mathrm{P}=\frac{1}{6 R}\)

Subtopic:  Lenses |
 59%
From NCERT
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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%
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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%
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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%
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