Study the ray diagram and answer the questions. State the type of lens used.

The type of lens is convex or converging as the light rays actually meet after refraction.

Study the ray diagram and answer the questions. List two properties of image formed.

As the object is placed between the centre of curvature and focus of the convex lens, the image formed is real, inverted and enlarged.

Study the ray diagram and answer the questions. For what position of object will magnification be 1 ?

A convex lens will produce same sized image when the object is placed at the centre of curvature. So the magnification is one when the object is placed at 2 F 1 .

The following table gives the values of refractive indices of a few media. 1 2 3 4 5 Medium Water Crown glass Rock salt Ruby Diamond Refractive index 1 . 33 1 . 52 1 . 54 1 . 71 2 . 42 Use this table to give an example of a medium pair so that light speeds up when it goes from one of these media to another.

Speed of light increases in travelling from a medium of high refractive index to that of low refractive index. Thus, speed of light increases when light travels from crown glass to water.

The following table gives the values of refractive indices of a few media. 1 2 3 4 5 Medium Water Crown glass Rock salt Ruby Diamond Refractive index 1.33 1.52 1.54 1.71 2.42 Use this table to give an example of a medium pair so that light slows down when it goes from one of these media to another.

When light travel from rarer medium to denser medium, it slows down. So when the light is travelling to diamond from water, it will slow down.

E M B I B E

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 3

HARD

10th CBSE

IMPORTANT

Earn 100

How far from a concave mirror of focal length $20 cm$ , should an object be placed to form a real image of size one-fifth of the object size?

Important Questions on Light Reflection and Refraction

MEDIUM

10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 3

Define lateral displacement. List the factors on which lateral displacement depends.

MEDIUM

10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 3

An object of size

5 cm

is kept at a distance of

25 cm

from a converging lens of focal length

10 cm

. Calculate the distance of the image from the lens and size of the image.

EASY

10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 3

Study the ray diagram and answer the questions.
Question Image

State the type of lens used.

EASY

10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 3

Study the ray diagram and answer the questions.
Question Image

List two properties of image formed.

MEDIUM

10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 3

Study the ray diagram and answer the questions.
Question Image

For what position of object will magnification be

1

?

MEDIUM

10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 3

The following table gives the values of refractive indices of a few media.

	$1$	$2$	$3$	$4$	$5$
Medium	Water	Crown glass	Rock salt	Ruby	Diamond
Refractive index	$1.33$	$1.52$	$1.54$	$1.71$	$2.42$

Use this table to give an example of a medium pair so that light speeds up when it goes from one of these media to another.

MEDIUM

10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 3

The following table gives the values of refractive indices of a few media.

	1	2	3	4	5
Medium	Water	Crown glass	Rock salt	Ruby	Diamond
Refractive index	1.33	1.52	1.54	1.71	2.42

Use this table to give an example of a medium pair so that light slows down when it goes from one of these media to another.

MEDIUM

10th CBSE

IMPORTANT

SCIENCE PHYSICS>Chapter 1 - Light Reflection and Refraction>EXERCISES>Q 3

The path of a light ray, from air to three different media (a), (b), and (c), for a given angle of incidence, is as shown. Study the diagram carefully and answer the following questions.

Question Image