Screen1102 Aptitude Test Problems in Physics
What will be the change in the luminousflux through the hole? Neglect the absorp-
tion of light in the substance.
4.9. The objective and the eyepiece of a
telescope are double-convex symmetrical
lenses made of glass with a refractive index
n = 1.5. The telescope is adjusted to
infinity when the separation between the
objective and the eyepiece is Lo = 16 cm.
Determine the distance L separating the
objective and the eyepiece of the telescope
adjusted to infinity with water poured in
the space between the objective and the eye-
piece (n, = 1.3).
4.10. A spider and a fly are on the surface
of a glass sphere. Where must the fly be
for-the spider to be able to see it? Assume
that the radius of the sphere is much larg-
er than the sizes of the spider and the fly.
The refractive index of glass is no = 1.43.
4.11. A point light source S is outside a cyl-
inder on its axis near the end face (base).