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Class 9 FRANK Solutions Physics Chapter 6 - Light - Spherical Mirrors

Practise Frank Solutions for ICSE Class 9 Physics Chapter 6 Light - Spherical Mirrors to aim for a higher score in your exam. Find out the key differences between virtual images and real images. Also, revise the terms such as principal axis, pole, aperture, concave mirror, convex mirror, etc.

Use TopperLearning’s ICSE Class 9 Frank textbook solutions to determine the focal length of a spherical mirror. To learn further about spherical mirrors and light, browse our extensive e-learning resources. Now, study as per your convenience with our 24/7 online access to chapter-wise revision notes, videos and more.

Light - Spherical Mirrors Exercise 258

Solution 1

A spherical mirror is a part of a hollow glass sphere silvered on one side.

Solution 2

Solution 3

Focal length = 1/2 of radius of curvature
= 1/2 X 30 = 15cm.

Solution 4

Focal point is the principal focus of the mirror where a parallel beam of light meets(or appear to meet) after reflection from the mirror.

Solution 5

Solution 6

(i). Pole is the centre of the reflecting surface, in this case spherical mirror.
(ii). Centre of curvature is the centre of the imaginary sphere to which the mirror belongs
(iii). Aperture is the distance between the extreme points on the periphery of the mirror.
(iv). Principal axis is the straight line passing through the pole and the centre of curvature.
(v) The principle focus of a spherical mirror may be defined as a point on its principle axis where a beam of light parallel to the principle axis converges to or appears to diverge from after reflection from the spherical mirror.

Solution 7

Convex mirror has a wider field of view.

Solution 8

Concave mirrors are used in reflecting microscope, in shaving and make up glasses and in ophthalmoscope.

Solution 9

Convex mirrors are used as a rear view mirror in automobiles as it provides a wider view of following traffic.

Solution 10

Convex mirror is used in vehicles to see the traffic following it.

Solution 12

Solution 13

Solution 14

Concave mirror can produce real and diminished image of the object.

Solution 15

The focal length of plane mirror is infinity.

Solution 16

The object should be placed between F and P to obtain its magnified and erect image.

Solution 17

Solution 18

Linear magnification is defined as the ratio of the height of the image to the height of the object. It is taken to be positive for an image to be virtual and erect and negative when image is real and inverted.
Magnification = height of image / height of object.

Solution 19

SI unit of focal length is meter.

Solution 20

The top mirror is convex mirror, the middle mirror is concave mirror and bottom mirror is a plane mirror.

Solution 21

The mirror having +15 cm as its focal length is a convex mirror because focal length is taken positive only in case of convex mirror.

Solution 22

The mirror having -20 cm as its focal length is a concave mirror because focal length is taken negative only in case of concave mirror.

Solution 23

When we look into a plane mirror, the image of our face is virtual because the image cannot be obtained on a screen.

Solution 24

When an object is brought towards the concave mirror, the position of the image moves away from the mirror and the size increases and it remains inverted but at object position between F and P, the image is virtual, magnified and erect.

Solution 25



Light - Spherical Mirrors Exercise 259

Solution 26

Solution 27

Solution 28

Solution 29

Solution 30

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