PHY103
If a ray of light strikes a pane of glass at 45 degrees to the normal, it
Answer: leaves with the same angle to the normal, but is deflected to the side.
Incident ray, refracted ray and normal ray all lie on same plane, as per
Answer: first law of refraction
A ray of light passing through the focal point at an angle to the optic axis of a concave mirror is reflected back
Answer: parallel to the optic axis.
A ray reflected from a retroreflector
Answer: travels in the direction opposite that
A diverging lens has a focal length of 10 cm. Where is the image located when an object is placed 30 cm from the lens?
Answer: 7.5 cm on the near side
For a converging lens, a ray arriving parallel to the optic axis
Answer: passes through the principal focal point
The shortest mirror in which a creature from outer space can see its entire body is its height.
Answer: one half
As per second law of refraction, ratio of sine of angle of incidence to sine of angle of refraction is
Answer: a constant
Where is the image located when an object is placed 30 cm from a convex mirror with a focal length of 10 cm? Note: you should have to figure this out exactly. Only one answer is in the right ballpark.
Answer: 7.5 cm in back
Ratio (speed of light in air or vacuum/speed of light in a medium) is equal to
Answer: none of the above
An optical medium where speed of light is slower than another is said to be
Answer: optically denser
For each angle of incidence, corresponding value of angle of reflection is
Answer: same
A ray of light parallel to the optic axis of a concave mirror is reflected back
Answer: through the focal point
The back surfaces of automobile headlights are curved
Answer: to concentrate light in one direction
Bending effect of light as it passes from one transparent material into other is known as
Answer: refraction
The dispersion of light when it passes through a prism shows that
Answer: different colors have different indices of refraction
A diverging lens has a focal length of 10 cm. Where is the image located when an object is placed 30 cm from the lens?
Answer: through the center of the sphere
What type of image is formed when an object is placed at a distance of 1.5 focal lengths from a convex mirror?
Answer: erect and virtual
What happens to the image produced by a pinhole camera when you move the back wall farther from the pinhole? It becomes
Answer: larger and fainter
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