1.
Find the focal length of the mirror that forms an image 6.2 cm behind the mirror of an object placed at 26 cm in front of the mirror?

2.
The lens with a long focal length is

3.
The variation of focal length to form a sharp image on retina is called

4.
In concave mirror, the size of image depends upon

5.
When light travelling in a certain medium falls on the surface of another medium, a part of it turns back in the same medium. This phenomenon is called

6.
If the object is towards the right side of the lens, the object distance will be

7.
The power of magnifying glasses given by

8.
In astronomical compare to eye piece, objective lens has

9.
The inability of eye to see the objects clearly is called

10.
The size of the image is always smaller than the object in

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