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

EASY

NEET

IMPORTANT

Earn 100

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

50% studentsanswered this correctly

Important Questions on Ray Optics

MEDIUM

NEET

IMPORTANT

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 :

MEDIUM

NEET

IMPORTANT

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.

EASY

NEET

IMPORTANT

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

MEDIUM

NEET

IMPORTANT

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

EASY

NEET

IMPORTANT

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

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 146

A thin convex lens of refractive index

1.5

is placed in a liquid with refractive index

2.0 .

If the power of the lens in air is

10 D

then, its power in the liquid will be

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 147

A body is located on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance

d

ahead of second wall, then the required focal length will be:

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-1>Q 148

An equiconvex lens is cut into two halves along $(i)$ $X O X'$ and $(ii)$ $Y O Y'$ as shown in the figure. Let $f, f^{'}, f^{''}$ be the focal lengths of the complete lens, first half cut along $X O X^{'}$ and second half cut along $Y O Y^{'}$ respectively.