QuestionKart - Questions

cds- Question :

The position, relative size and nature of the image formed by a concave lens for an object placed at infinity are respectively

A :

at focus, diminished and virtual

B :

at focus, diminished and real

C :

between focus and optical centre, diminished and virtual

D :

between focus and optical centre, magnified and real

cds- Question :

contact lenses are made form

A :

polyvinyl chloride

B :

polystyrene

C :

lucite

D :

teflon

cds- Question :

No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

A :

Either plane or convex

B :

plane only

C :

concave

D :

convex

cds- Question :

The upper and lower portions in common type of bi-focal lenses are respectively

A :

concave and convex

B :

convex and concave

C :

both concave of different focal lengths

D :

both convex of different focal lengths

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