Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 137

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The focal length of a convex lens made from a material of refractive index $1.52$ is $10 cm$ when placed in air. If it is immersed in carbon disulphide of refractive index $1.68$ , then its focal length and nature will be

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Important Questions on Ray Optics

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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 138

Two symmetric double convex lenses

A

and

B

have the same focal length, but the radii of curvature differ so that,

R_{A} = 0.9 R_{B}

. If

n_{A} = 1.63

, find

n_{B}

.

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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 139

When a lens of power

P

(in air) made of material of refractive index

μ

is immersed in a liquid of refractive index

μ_{0}

. Then the power of the lens is:

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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 140

A thin symmetrical double convex lens of power $P$ is cut into three parts as shown in the figure below. Power of $A$ is:

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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 141

A convex lens makes a real image of height

4 cm

on a screen. When the lens is shifted to a new position without disturbing the object or the screen, a real image of height

16 cm

is obtained on the screen. The length (height) of the object is :

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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 142

An object is placed at a distance of

10 cm

from a convex lens of power

5 D .

Find the position of the image.

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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 143

The radius of the convex surface of plano-convex lens is

20 cm

and the refractive index of the material of the lens is

1.5

. The focal length of the lens is

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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 144

A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens is

4 D,

then the power of a cut lens will be

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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 145

A point object is placed at the focus of a double concave lens. The image is formed