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The graph shows how the inverse of magnification $\frac{1}{m}$ produced by a convex thin lens varies with object distance $u$ . What was the focal length of the lens used?

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Important Questions on Geometric Optics

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 2]>Q 12

The graph between

u

and

v

for a convex mirror is

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JEE Advanced

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 2]>Q 13

A concave lens of focal length

20 cm

placed in contact with a plane mirror acts as a

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 2]>Q 14

A convex lens produces an image of a real object on a screen with a magnification of

\frac{1}{2}

. When the lens is moved

30 cm

away from the object, the magnification of the image on the screen is

2

. The focal length of the lens is

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 2]>Q 15

An infinitely long rod lies along the axis of a concave mirror of focal length

f

. The near end of the rod is at a distance

u > f

from the mirror. Its image will have a length

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 2]>Q 16

A liquid is placed in a hollow prism of angle

60 °

. If angle of the minimum deviation is

30 °

. What is the refractive index of the liquid?

HARD

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 2]>Q 17

A point object is moving with a speed $v$ before an arrangement of two mirrors as shown in figure.

Question Image

Find the velocity of image in mirror $M_{1}$ with respect to image in mirror $M_{2}$ .

MEDIUM

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 2]>Q 18

How much water should be filled in a container of height

21 cm

, so that it appears half filled to the observer when viewed from the top of the container

(μ = \frac{4}{3})

MEDIUM

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 7 - Geometric Optics>Objective Problems [Level 2]>Q 19

Optic axis of a thin equi-convex lens is the

X

-axis. The coordinates of a point object and its image are

(- 40 cm, 1 cm)

and

(50 cm, - 2 cm)

respectively. Lens is located at

The graph shows how the inverse of magnification 1m produced by a convex thin lens varies with object distance u. What was the focal length of the lens used?

Important Questions on Geometric Optics

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The graph shows how the inverse of magnification $\frac{1}{m}$ produced by a convex thin lens varies with object distance $u$ . What was the focal length of the lens used?