Optics Answers

Suppose that one half of a concave mirror reflecting surface is covered with nonreflecting suit. What effect will this have on the image of an object placed infront of mirror?

A step index fibre 6.35 x 10-5 m in diameter
has a core of refractive index 1.52 and a
cladding of refractive index 1.47. Determine
the numerical aperture for the fibre and the
acceptance angle.

Obtain the
expression for area of the nth zone.

Newton's rings are formed in reflected light
of wavelength 6000A with a liquid between
the plane and curved surfaces. The diameter
of 7thdark ring is 0.34 cm and the radius of
curvature of curved surface is 100 cm.
Calculate the refractive index of liquid.

Two waves of the same frequency and
constant phase difference have intensities in
the ratio 36 : 4. These waves are superposed
and interference fringe pattern is obtained.
Calculate the ratio of the maximum to
minimum intensity.

An object placed in front of a convex mirror of radius 20cm produces an erect image which is one-fifth the size of the object. How far is the object from the mirror

A concave shaving mirror has a focal length
of 36 cm.
a) Calculate the image position of a cologne
bottle placed in front of the mirror at a distance
of 76 cm. (Answer with −1000 if the
image does not exist.)
Answer in units of cm.

The focal length of the equivalent mirror of a equiconvex lens silvered at one side

Numerical aperture of fibre is 0.5 and the core refractive index is 1.48 find the refractive index of the cladding acceptance angle

Why does the frequency not change when refraction occurs? It has to change as the wavelength becomes shorter, causing more waves to pass in a second. Right?