Reflection of Light Exe-7C Numericals Concise Physics ICSE Class-9 Selina Publishers

Reflection of Light Exe-7C Numericals Concise Physics ICSE Class-9 Selina Publishers. There is the solutions of Numerical type Questions of your latest textbook which is applicable in 2024-25 academic sessionVisit official Website CISCE for detail information about ICSE Board Class-9

Reflection of Light Exe-7C Numericals Concise Physics ICSE Class-9 Selina Publishers

Reflection of Light Exe-7C Numericals

Concise Physics ICSE Class-9 Selina Publishers solutions

Board ICSE
Class 9
Subject Physics
Writer / Publication Concise Selina Publishers
Chapter-7 Reflection of Light
Exe-7C Sphericals Mirrors Image Formation
Topics Solution of Exe-7(C) Numericals
Academic Session 2024-2025


Spherical Mirrors Numerical Problems

Reflection of Light Exe-7C Numericals Concise Physics ICSE Class-9 Selina Publishers

page -189

Que -1: The radius of curvature of a convex mirror is 40 cm. Find its focal length.

Solution- Focal length = ½ (Radius of curvature)

Or, f = 402 = 20 cm.

Que-2: The  focal length of a concave mirror is 10 cm. Find its radius of curvature.

Solution- Radius of curvature = 2 × focal length

Or, R = 2f = 2 × 10 = 20 cm.

Que-3: An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror of a focal length of 12 cm. Find the position, size, and nature of the image.

Solution-

3- An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror of a focal length of 12 cm. Find the position, size, and nature of the image.

The image is 30 cm in front of the mirror, 3 cm high, real, inverted and magnified.

Que-4: An object is placed at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. Find the position of image. Is the image magnified?

Solution-

concave mirror of radius

The image is 6 cm behind the mirror.

Yes the image is magnified.

Que-5: At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.

Solution- The size of the image is equal to the size of the object if the object is placed at the centre of curvature of a concave mirror.

5- At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.

Hence, the object should be placed at 50 cm.

Que-6: An object  5 cm high is placed at a distance 60 cm in front of a concave mirror of focal length 10 cm. Find the position and size of the image.

Solution-
6- An object  5 cm high is placed at a distance 60 cm in front of a concave mirror of focal length 10 cm. Find the position and size of the image.
The position of the object is 12 cm in front of the mirror.
Its size is 1 cm.

Que-7:  A point light source is kept in front of a convex mirror at a distance of 40 cm. The focal length of the mirror is 40 cm. Find the position of image.

Solution-

7- A point light source is kept in front of a convex mirror at a distance of 40 cm. The focal length of the mirror is 40 cm. Find the position of image.

The image is behind the mirror at a distance 20 cm.

Que-8: When an object of height 1 cm is kept at a distance 4 cm from a concave mirror, its erect image of height 1.5 cm is formed at a distance 6 cm behind the mirror. Find the focal length of mirror

Solution-

When an object of height 1 cm is kept at a distance 4 cm from a concave mirror, its erect image of height 1.5 cm is formed at a distance 6 cm behind the mirror. Find the focal length of mirror

A ray passing parallel to the principal axis passes through the focal point after reflection. Hence, the focal length is 12 cm.

Que-9: An object of length 4 cm is placed in front of a concave mirror at distance 30 cm. The focal length of mirror is 15 cm.
  1. Where will the image form?
  2. What will be the length of image.

Solution-

Concise 9th physic numerical 9 Exe- 9(C)

Que-10: A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find (a) the focal length of mirror (b) position of image.

Solution-

Concise 9th physic numerical 10 Exe- 9(C)

Que-11: A concave mirror forms a virtual image of size twice that of the object placed at a distance 5 cm from it.

Find : (a) the focal length of the mirror (b) position of image

Solution-

Concise 9th physic numerical 11 Exe- 9(C)

Que-12: The image formed by a convex mirror is of size one third the size of object. How are u and v image?

Solution-

Concise 9th physic numerical 12 Exe- 9(C)

Que-13: The erect image formed by a concave mirror is of size double the size of object. How are u and v image?

Solution- Magnification is

Concise 9th physic numerical 13 Exe- 9(C)

Que-14:  The magnification for a mirror is -3. How are u and v related?

Solution- Magnification of a mirror is

Concise 9th physic numerical 14 Exe- 9(C)

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