Q.1
A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism isand the prism is made of a material of refractive index 1.the angle of incidence is
  • 7.5°
  • 5°
  • 15°
  • 2.5°
Q.2
The focal length of a biconvex lens of radii of each surfacecm and refractive index 1.is
  • 40.4 cm
  • 75 cm
  • 50 cm
  • 80 cm
Q.3
Tom’ lenses of focal lengths ±cm and ±cm are available for making a telescope. To produce the largest magnification, the focal length of the eyepiece should be
  • + 15 cm
  • + 150 cm
  • – 150 cm
  • – 15 cm
Q.4
A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
  • become zero
  • become infinite
  • become small, but non-zero
  • remain unchanged
Q.5
The refractive index of the material of an equilateral prism is √What is the angle of minimum deviation?
  • 45°
  • 60°
  • 37°
  • 30°
Q.6
An astronomical refractive telescope has an objective of focal lengthm and an eyepiece of focal length 2 cm. Then
  • the magnification is 1000
  • the length of the telescope tube is 20.02 m
  • the image formed of inverted
  • all of these
Q.7
Two beams of red and violet color are made to pass separately through a prism (angle of the prism is 60°). In the position of minimum deviation, the angle of refraction will be
  • 30° for both the colors
  • greater for the violet color
  • greater for the red color
  • equal but not 30° for both the colors
Q.8
Which optical instrument is inserted in the body in order to observe internal passages such as a person’s esophagus or intestines?
  • Camera
  • Endoscope
  • Magnifying glass
  • Periscope
Q.9
The image formed by a magnifying glass has a properties of __________.
  • Real, inverted and enlarged
  • Virtual, inverted and enlarged
  • Real, upright and enlarged
  • Virtual, upright and enlarged
Q.10
What is the first image produced by a compound microscope?
  • Real and inverted
  • Real and erect
  • Virtual and erect
  • Virtual and inverted
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