A lens with two convex surfaces, both with radii of curvature of 0.25 meters, is

Question

A lens with two convex surfaces, both with radii of curvature of 0.25 meters, is used to focus light. If the lens is made of crown glass, it would have an index of refraction for red (656 nm) light of 1.509 and for blue light (486 nm) of 1.517. What happens when it is used to make an image of a distant source of white light?

PICK ALL THOSE THAT APPLY:

1.When the red light is in focus it is surrounded by a blue halo.

2. The blue light focuses closer to the lens than the red light.

The red light falls in a cone outside the blue light as it the light converges to a focus, so when blue is in focus there is a fuzzy red ring around it.

4. The red light focuses closer to the lens than the blue light.

1.When the red light is in focus it is surrounded by a blue halo.

2. The blue light focuses closer to the lens than the red light.

The red light falls in a cone outside the blue light as it the light converges to a focus, so when blue is in focus there is a fuzzy red ring around it.

4. The red light focuses closer to the lens than the blue light.

Explanation / Answer

The blue light focuses closer to the lens than the red light.

The refractive index more for blue, so it's speed is less and it's angle of deviation is more.

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