BPSC – Combined Competitive Examination · প্রশ্ন 91
What type of lens is used in a magnifying glass?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (B) Convex lens
ব্যাখ্যা
A simple magnifier is a convex lens held so the object is within its focal length.
- (A) ভুল
Wrong: concave lenses diminish.
- (B) সঠিক
Correct: a convex lens gives a magnified virtual image when the object is within focus.
- (C) ভুল
Wrong: a mirror, not a lens.
- (D) ভুল
Wrong: diminishes images.
- (E) ভুল
Wrong: only one of the options A–D is correct.