A concave lens forms the image of an object such that the distance between the object and image is 10 cm. If magnification of the image is 14. The focal length of the lens is

(1) 6 cm

(2) 203 cm

(3) 107 cm

(4) 409

Subtopic:  Lenses |
 58%
From NCERT
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When an object is placed at 10 cm and 30 cm from a convex lens images obtained are of the same magnitude of magnification. The focal length of the lens maybe:

(1) 10 cm

(2) 15 cm

(3) 20 cm

(4) 25 cm

Subtopic:  Lenses |
 58%
From NCERT
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To increase the magnifying power of a telescope:

1.  The focal length of the eyepiece should be increased.
2. The focal length of the objective should be increased.
3. The wavelength of light should be increased.
4. The aperture of the eyepiece should be increased.

Subtopic:  Telescope |
 85%
From NCERT
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A ray of light is incident on a prism of angle A and refractive index μ will not emerge out of prism for any angle of incidence, if

(1) μ>sinA2

(2) μ>cos A

(3) μ<1sin A

(4) μ>1sin A2

Subtopic:  Prisms |
 57%
From NCERT
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What should be the maximum angle of acceptance at the air core interface of an optical fiber, if n1 and n2 are the refractive indices of the core and the cladding respectively?

(1) sin-1n2n1

(2) sin-1n12-n22

(3) tan-1n2n1

(4) sin-1n1n2

Subtopic:  Total Internal Reflection |
 62%
From NCERT
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The focal length of a glass μ=1.5 lens in air is 20 cm. If it is dipped in water μ=43, its focal length in water will be:

1. 80 cm 2. 40 cm
3. 60 cm 4. 20 cm
Subtopic:  Lens Makers' Formula |
 65%
From NCERT
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Two positions of the convex lens for which the image of the object is formed on the same screen are 40 cm and 80 cm from the object. The focal length of the lens is

1.  803cm

2.  403cm

3.  40 cm

4.  80 cm

Subtopic:  Refraction at Curved Surface |
 57%
From NCERT
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When a concave mirror of focal length f is immersed in water, its focal length becomes f', then:

1. f'=f
2.  f'<f
3.  f'>f
4.  The information is insufficient to predict

Subtopic:  Reflection at Spherical Surface |
 70%
From NCERT
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A person cannot see objects clearly that are closer than 2 m and farther than 4 m. To correct the eye vision, the person will use:

(1) Bifocal lenses of power -3.5 D and 0.25 D

(2) Bifocal lenses of power -0.25D and 3.5 D

(3) Bifocal lenses of power -0.5D and 4.0D

(4) Bifocal lenses of power -4.0D and 0.5 D

Subtopic:  Human Eye |
 65%
From NCERT
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A graph is plotted between the angle of deviation δ in a triangular prism and the angle of incidence as shown in the figure. Refracting angle of the prism is: 

 
1. \(28^\circ\)
2. \(48^\circ\)
3. \(36^\circ\)
4. \(46^\circ\)

Subtopic:  Prisms |
 72%
From NCERT
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