An object $20 cm$ tall is placed on the principal axis of a convex lens. Its $30 cm$ tall image is formed on the screen placed at a distance of $10 cm$ from the lens. Calculate the focal length of the lens.

Important Questions on Light - Reflection and Refraction

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>EXERCISE - 1D>Q 12

An object

30 cm

tall is placed on the principal axis of a convex lens. Its

10 cm

tall inverted image is formed on the screen placed at a distance of

15 cm

from the lens. Calculate the focal length of the lens.

HARD

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>EXERCISE - 1D>Q 14

A convex lens of focal length

20 cm

produce a magnified virtual as well as real images. Is this a correct statement? If yes, where shall the object be placed in each case to obtain these images?

MEDIUM

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>EXERCISE - 1D>Q 15

Under what condition in an arrangement of two plane mirrors, incident ray and reflected ray will always be parallel to each other, whatever may be angle of incidence. Show the same with the help of diagram.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>EXERCISE - 1D>Q 1

You are required to form an upright image which is: (i) enlarged, (ii) diminished by using a lens. State the nature of the lens in each case and draw a neat ray diagram in support of your answer.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>EXERCISE - 1D>Q 2

State the lens formula.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 1 - Light - Reflection and Refraction>EXERCISE - 1D>Q 2

State whether u, v and f are positive or negative, when: the lens is convex and the image formed is real.

EASY

10th CBSE