The figure illustrates a number of optical lenses made of glass with index of refraction n. 

If used in eyeglasses, that type of lens would help for: (choose far sighted or near sighted)
a. W, for a .... person.
b. Y, for a .... person.
c. X, for a .... person.

 How far from a concave mirror (radius 23.4 cm) must an object be placed if its image is to be at infinity?

 

3. The image of a distant tree is virtual and very small when viewed in a curved mirror. The image appears to be 14.1 cm behind the mirror. What is its radius of curvature? (Use positive for concave and negative for convex).

 

4. The figure illustrates a number of optical lenses made of glass with index of refraction n. An equation from which the focal length of each lens in air can be calculated is:
1/f = ( n-1 )( ± 1/r1 ± 1/r2 )
where r1 and r2 are the magnitudes of the radii of curvature of the lens surfaces.

Indicate the signs which are appropriate for the 1/r1 and 1/r2 terms in that equation:

a. For lens Z, the respective signs of 1/r1 and of 1/r2 are ....
b. For lens W, the respective signs of 1/r1 and of 1/r2 are ....
c. For lens Y, the respective signs of 1/r1 and of 1/r2 are ....

 

5. A dentist wants a small mirror that, when 2.12 cm from a tooth, will produce a 4.62x upright image. What is the mirror's radius of curvature?

 

6. The magnification of a convex mirror is +0.600x for objects 2.00 m from the mirror. What is the focal length of this mirror?

 

7. The refractive index of a transparent material can be determined by measuring the critical angle when the solid is in air. If θ_c= 41.7^o, what is the index of refraction of the material?

 

Transcribed Image Text:

N D X r2 r2 r1 1 r2 f r1 W r1 r2 N D X r2 r2 r1 1 r2 f r1 W r1 r2

Answer rating: 100% (QA)

question 1 To answer the question about the lenses we need to understand how they work Convex lenses thicker in the middle bend light rays inward while concave lenses thinner in the middle bend light ... View the full answer