# Reflection of Light Exe-7C Very Short Answer Concise Physics ICSE Class-9 Selina Publishers

Reflection of Light Exe-7C Very Short Answer Concise Physics ICSE Class-9 Selina Publishers. There is the solutions of Very short Answer 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 Very Short Answer Type

###### Concise Physics ICSE Class-9 Selina Publishers.
 Board ICSE Class 9 Subject Physics Writer / Publication Concise Selina Publishers Chapter-7 Reflection of Light Exe-7C Spherical Mirrors Image Formation Topics Solution of Exe-7(C) Very Short Answer Type Academic Session 2024-2025

### Exercise- 7C Spherical Mirrors Image Formation

page -189

#### Very Short Answer :

##### Q1- What is a spherical mirror?

Ans- A reflecting surface which is a part of a sphere is called a spherical mirror.

##### Q2- Define centre of curvature of a spherical mirror.

Ans- The point in the centre of the sphere from which the mirror was sliced is known as the centre of curvature.

##### Q3- Define radius of curvature of a spherical mirror.

Ans-The distance between the centre of curvature and pole of a spherical mirror is known as the radius of curvature.

##### Q4- What is the aperture of a spherical mirror?

Ans- The portion of a mirror from which the reflection of light actually takes place is called the aperture of the mirror.

##### Q5- Define the pole of a spherical mirror.

Ans- The pole of a spherical mirror is the centre of the reflecting surface of the spherical mirror.

##### Q6- Name the mirror which always produces an erect and virtual image. How is the size of image related to the size of object?

Ans- Convex mirror always produces erect and virtual images. The images formed are diminished, i.e. the size of the image is shorter than the size of the object.

##### Q7- For what position of object, the image formed by a concave mirror is magnified and erect?

Ans- If the object is placed between the pole and focus of a concave mirror, the image formed is magnified and erect

##### (b) Write two more characteristics of the image.

Ans (a) If the object is placed at the centre of curvature of a concave mirror, the image formed is of same size.
(b) The image formed is real and inverted.

##### (c) Does the mirror mentioned in part (b) form real image for all locations of the object?

Ans (a) When the  rays of light diverging from a point, after reflection of refraction, actually converge at some point, then that point is the real image of the object.

(b) A concave mirror can be used to obtain a real image of an object.

(c) No, it does not form real image for all locations of the object.

##### Q10- Name the kind of mirror used to obtain :

(a) A real and enlarged image

Ans (a) Concave
(b) Concave
(c) Convex
(d) Concave.

##### Q11- How is the focal length of a spherical mirror related to its radius of curvature?

Ans- Focal length is half the radius of curvature of a spherical mirror.
f=R/2.

##### Q12- Write the spherical mirror’s formula and explain the meaning of each symbol used in it.

Ans- The spherical mirror’s formula is 1/u+1/v=1/f
Here, u is the object distance, v is the image distance and f is the focal length of the mirror.

##### Q13- State the kind of mirror used
###### (b) As a search-light reflector.

Ans- (a) Concave mirror

(b) Concave mirror

##### Q14- Which mirror will you prefer to use as a rear view mirror in a car : plane mirror or convex mirror? Give one reason.

Ans- A convex mirror is preferred as a rear view mirror because it has a wider field of view as compared to a plane mirror of same size.

##### Q15- How is magnification (m) related to the distance of the object (u) and the distance of the image (v) ?

Ans- Magnification = –(Image Distance)/ (Object Distance)
That is,m = -v/u

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