Q13 of 123 Page 410

A single lens is mounted in a tube. A parallel beam enters the tube and emerges out of the tube as a divergent beam. Can you say with certainty that there is a diverging lens in the tube?

Of course, we can say. Only reflection of light does not create divergence, it needs refractive index changes to diverge. Hence, there certainly is a diverging lens.


More from this chapter

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11

The equation of refraction at a spherical surface is


Taking, show that this equation leads to the equation



for refraction at a plane surface.


 12

A thin converging lens is formed with one surface convex and the other plane. Does the position of image depend on whether the convex surface or the plane surface faces the object?

 14

An air bubble is formed inside water. Does it act as a converging lens or a diverging lens?

 15

Two converging lenses of unequal focal lengths can be used to reduce the aperture of a parallel beam of light without losing the energy of the light. This increase the intensity. Describe how the converging lenses should be placed to do this.