Which type of lenses are:
a) Thinner in the middle than at the edges?
b) thicker in the middle than at the edges?

A. a convex lens a. is thicker at the edges than at the middle. b. is thicker at the middle than at the edges. c. Diverges rays of light. d. is of uniform thickness everywhere. B. with the help of a ray diagram sketch the image formation of a convex lens when the object is between C and F. C. Derive the lens maker's formula.

________ lens is thinner at the centre than at the edges.

A convex lens is ……… in the miiddle than at edges

__________ lens is thicker at the centre than at the edges.

A person got his eyes tested by an option. The prescription for the spectacle lenses to be made reads: Left eye: +2.50 D Right eye: +2.00 D a) State whether these lenses are thicker in the middle or at the edges. b) Which lens bends the light rays more strongly? c) State whether these spectacle lenses will converge light rays or diverge light rays.

The optical prescription for a pair of spectacles is: Right eye: -3.50 D Left eye: -4.00 D a) Are these lenses thinner at the middle or at the edges? b) Which lens has a greater focal length? c) What is the weaker eye?

Fill in the following blanks with suitable words : A Convex lenses are ______________ in the middle than at the edges whereas concave lenses are _________ in the middle than at the edges.