মূল বিষয়বস্তুতে যান

State PCS PYQPrelims 2023

BPSC – Combined Competitive Examination · প্রশ্ন 15

The image formed by a concave mirror is real, inverted and of the same size as the object. The position of the object should be:

at the focus
at the centre of curvature
between the focus and centre of curvature
beyond the centre of curvature

উত্তর দেখান ও ব্যাখ্যা

উত্তর: (B) at the centre of curvature

ব্যাখ্যা

For a concave mirror, an object at C (2f) forms a real, inverted, same-size image at C.

(A) ভুল
Wrong: image forms at infinity.
(B) সঠিক
Correct: object at C gives a same-size, real, inverted image at C.
(C) ভুল
Wrong: image is enlarged beyond C.
(D) ভুল
Wrong: image is diminished between F and C.