Name the type of lens which always produces virtual image.

08/11/2023 WNA24 85 Views 0 Comments

Name the type of lens which always produces virtual image.

Ans: – The concave lense always produce virtual images.

Draw the ray diagram for the image formation in convex lens where object is placed at (i) F (ii) between F and 2F (iii) beyond 2F.

Ans: –

Draw the ray diagram for image formation in concave lens.

Ans: –

The sizes of the image and object are equal in a lens of focal length 20 cm. Name the type of lens and distance of object from the lens.

Ans: – The lense must be convex lens.

The distance of object from the lens will be at 2F or 2×20 or 40cm.

An object of size 10 cm is placed infront of convex lens of focal length 20 cm. Find the size of the image formed.

Ans: – We know from lens formula, 1/f = 1/v – 1/u,

Here, f=20cm, u=-10cm, v=?

So, 1/20 = 1/v + 1/10;

Or, v=20cm.