Page 1 - HA-refraction by convex lens

Objective Questions:

1. What are Convex lenses?
a) Thicker from the centre than at the edge
b) Thinner from the centre than at the edge
c) Thicker from both the positions
d) Thinner from both the positions

2. Out of the following which one is converging lens?
a) Biconvex
b) Plano-convex
c) Biconcave
d) Positive meniscus

3. Where does the principal axis intersect the two refracting surfaces?
a) Front vertex and back vertex
b) Focal length
c) Radius of curvature
d) Principal focus

4. If the object is at infinity, where and how will the image form?
a) At 2F, real, inverted and of same size
b) At F, point size, real and inverted
c) Between F and 2F, real, inverted and diminished
d) Beyond 2F, real, inverted and magnified

5. If the lens is placed in water, then the refractive index with respect to water will be
________
a) m=a/b
b) m=b/a
c) m*a=b
d) m/b=a

6. From which part of the lens, the ray of light passes without deviation?
a) Optical centre
b) Focus
c) Centre of curvature
d) Pole

7. When will the convex lens give a real image?
a) Beyond optical centre
b) Beyond focus
c) Beyond centre of curvature
d) Between focus and curvature

Subjective Questions:

1.What are some uses of a convex lens?
2. What is difference between concave and convex lens?