Topic 7: Geometrical Optics

The principle on which mirrors work is

• refraction

• polarization

• dispersion

• reflection

A light ray, traveling parallel to a concave mirror's axis, strikes the mirror's surface near its midpoint. After reflection, this ray

• again travels parallel to the mirror's axis.

• travels at right angles to the mirror's axis.

• passes through the mirror's center of curvature.

• passes through the mirror's focal point.

An object is situated between a concave mirror's surface and its focal point. The image formed in this case is

• real and inverted.

• real and upright.

• virtual and upright.

• virtual and inverted.

If you stand in front of a convex mirror, at the same distance from it as its radius of curvature,

• you won't see your image because there is none.

• you won't see your image because it's focused at a different distance.

• you will see your image and you will appear smaller.

• you will see your image and you will appear larger.

Convex spherical mirrors produce images which

• are always smaller than the actual object.

• are always larger than the actual object.

• are always the same size as the actual object.

• could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object.

A convex lens has focal length f. An object is located at infinity. The image formed is located

• between f and 2f.

• at f.

• between the lens and f.

• at 2f.

Which of the following best describes the image for a thin concave lens that forms whenever the magnitude of the object distance is less than that of the lens' focal length

• inverted, enlarged and real.

• upright, enlarged and virtual.

• upright, diminished and virtual.

• inverted, diminished and real.

The process of blending of light as it passes from air into glass and vice versa is called

• reflection of light.

• deflection of light.

• defraction of light.

• refraction of light.

When light travels in water or glass, its speed

• increases.

• remains constant.

• becomes zero.

• decreases.

If R1 and R2 are the radii of curvature of a plano convex lens,

• R1 is positive and R2 is negative.

• Both R1 and R2 are negative.

• R1 is positive and R2 is infinity.

• R1 is negative and R2 is infinity.