n1/u +n2/v=(n2-n1)/r for first refraction by convex surface: u??, v=rn2/(n2-n1) for plane reflection: r is infinite,v'=-v for second refraction: 1.5/v' -1/v''=(1-1.5)/r 1/v''+1/v=1/f power=1/f
48) A plano-convex lens, when silvered on the plane side, behaves like a concave mirror of focal length 30 cm. When it is silvered on the convex side, it behaves like a concave mirror of focal length 10 cm. The refractive index of the material of the lens is
Answer is:
1.5
Explanation:
Related Optics MCQ with Answers
Answer is:
complete image will be formed
Explanation:
A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen complete image will be formed
Answer is:
its wavelength decreases
Explanation:
When a ray of light enters a glass slab from air its wavelength decreases
Answer is:
is formed at the least distance of distinct vision
Explanation:
In a compound microscope, maximum magnification is obtained when the final image is formed at the least distance of distinct vision
Answer is:
5 R
Explanation:
use m=v/v, if=1/v + 1/u