Question

(a) What type of lens is used as a magnifying glass?
(b) What type of lens is used to correct the defect of vision called myopia?
​(c) A convex lens has a focal length of 10.5 cm. Where should an object be placed in front of this convex lens so as to obtain an image which is real, inverted and same size as the object?

Answer 1

Answer:

a) convex lens or converging lens

b) concave lens or diverging lens.

c) f = 10.5

so R = 2f = 2× 10.5

21cm

when the object is at centre of curvature then it produce image of same size

so it should be place at a distance of 21 cm from from its optical center to obtain real, inverted and same size image