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# Optics: Reflection, refraction and interference of light.

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1. An object is midway between the biconcave lens (with focal length -16.7 cm) and the concave mirror (with radius of curvature 20 cm). The mirror?lens distance is 25 cm. Considering only the light that leaves the object and travels first toward the mirror, locate the final image formed by this system. Is this image real or virtual? Is it upright or inverted? What is the overall magnification?

2. An air wedge is formed between two glass plates separated at one edge by a very fine wire. When the wedge is illuminated from above by 600-nm light, 30 dark fringes are observed. What is the radius of the wire?

(see diagram in attached file)

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#### Solution Preview

Please see the attached file.

1. An object is midway between the biconcave lens (with focal length -16.7 cm) and the concave mirror (with radius of curvature 20 cm). The mirrorâ€”lens distance is 25 cm. Considering only the light that leaves the object and travels first toward the mirror, locate the final image formed by this system. Is this image real or virtual? Is it upright or inverted? What is the overall magnification?

Answer:

The image 1 formed by the mirror will behave as a virtual object for the lens.

Using the sign convention, the ...

#### Solution Summary

The position nature and magnification of the image is obtained when the image is formed by first reflection from a concave mirror and then refraction from concave lens.
The radius of wire is calculated using the interferece of light from Wedge shaped air film.

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