Question

1) what is a virtual image ?

2) differentiate between concave and convex mirror

3) how will you identify the three mirror concave , convex and plane mirror without touching then

4) what is the focus length of the

plane mirror.

5) state the relation between radius of curvature and focal length of spherical mirror

6) out of convex and concave mirror whose focus is situated behind then mirror

7) if an object is placed at a distance of 0.5 meter in front of a plane mirror, the distance between the object and the image formed by the mirror will

be

a) 2m

b) 1m

c) 0.5 m

d) 0.25 m
​

Answer 1

Answer:

1) In optics, an image is defined as the collection of focus points of light rays coming from an object. A real image is the collection of focus points made by converging rays, while a virtual image is the collection of focus points made by extensions of diverging rays.

2 ) Spherical mirrors whose inner side is reflecting are called concave mirrors. Spherical mirrors whose outer side is reflecting are called convex mirrors. It's focus and centre of curvature lies behind the mirror.

3) Answer. Stand in front of mirror near it and look to your image. a) If the image is erect and of same size and size of image does not change even if you forward or backward, the mirror is a plane mirror. ... c)If the image is erect and magnified and becomes inverted if one moves away from the the mirror is a concave mirror ...

4) infinity

The focal length of a plane mirror is infinity; its optical power is zero.

5) The relation between focal length (f) and radius of curvature (R) of a spherical mirror is that the focal length is equal to half of the radius of curvature i.e. f=R2. ... We know that rays of light parallel to the principal axis passing through the focus (F) of a concave mirror, after reflection.

6) The focus of the convex mirror is situated behind the mirror, as the latter has a virtual focus.

Explanation:

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Answer 2

Answer:

`1. Virtual image refers to the image which forms when the light rays appear to meet at definite point, after reflection from the mirror. An erect image is one that appears right-side up. An erect image is formed by the actual intersection of rays.

3.The image formed is upright, virtual and enlarged if the object is kept at a distance less than the focus. Convex mirror – The image formed by a convex mirror is always upright, virtual and diminished no matter the distance of the object from the mirror.

4.the focal length of a plane mirror is infinity; its optical power is zero.

5.The relation between focal length (f) and radius of curvature (R) of a spherical mirror is that the focal length is equal to half of the radius of curvature i.e. f=R2. ... We know that rays of light parallel to the principal axis passing through the focus (F) of a concave mirror, after reflection.

6. The focus of the convex mirror is situated behind the mirror, as the latter has a virtual focus.

7.  b. 1m

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