Question

An equiconvex lens of focal length 10 cm (in air) and R.I.
3/2 is put at a small opening on a tube of length lm fully filled
with liquid of R.I. 4/3. A concave mirror ofradius of curvature
20 cm is cut into two halves M, and M, and placed at the end
of the tube. M, and M, are placed such that their principal
axes AB and CD respectively are separated by Imm each from
the principal axis of the lens. A slit S placed in air illuminates
the lens with light of frequency 7.5 x 1014 Hz. The light reflected
from M, and M forms interference pattern on the left end EF
of the tube. O is an opaque substance to cover the hole left by
M and M2. Width of the fringes on EF is (x * 10) um. Find the
value of x in metre.​

Answer 1

Answer:

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