Question

Consider the optically denser lenses P,
Q, R and S drawn below. According to
Cartesian sign convention which of these
have positive focal length?
pa
jii.
(A) Only P
(B) Only P and Q
(C) Only P and R
(D) Only Q and S
Two plane mirrors are inclined at angle
40° between them. Number of images
seen of a tiny object kept between them is
(A) Only 8
(B) Only 9
(C) 8 or 9
(D) 9 or 10
A concave mirror of curvature 40 cm
used for shaving purpose produces image
of double size as that of the object. Objec
distance must be
(A) 10 cm only
IV.
(D​

Answer 1

Explanation:

I think the answer will be only QS for only QP you please see it