4. A person's legs appear to be shorter when standing waist deep in a swimming pool due
to
A Diffraction
C. Reflection
B. Refraction
D. Polarization
5. When light passes from air to glass, which of the following does not change?
A. Frequency B. Speed C. Velocity
D. Wavelength
6. Describe the image formed by the human eye.
A. Magnified and real
C. Magnified and virtual
B. Diminished and real
D. Diminished and virtual
7. In most cameras, the location of the image is adjusted for the image to fall on the film by
changing the
A. Shape of the lens
B. Position of the lens
C. Focal length of the lens
D. Diameter of the diaphragm
8. The human eye is like a camera and hence it contains a system of lens. The eye lens
forms
A. an inverted, real image of the object on the retina
B. an inverted, virtual image of the object on the retina
C. a straight or upright, real image of the object on the iris
D. a straight or upright, real image of the object on the retina
9. From which part of the lens the ray of light passes without deviation?
A. Pole
B. Focus
C.Optical center
D. Center of curvature
10. A convex lens can correct:
A. Astigmatism
B. Farsightedness
C. Nearsightedness
D. All of the above
11. The human eye is like a camera and hence it contains a system of lens. The eye lens
forms
A, an inverted image in front of the retina
B. an inverted, real image of the object on the retina
C. a straight or upright, real image of the object on the iris
D. a straight or upright
, real image of the object on the retina
12. What kind of image is created by a concave lens?
A. upright and smaller
B. inverted and smaller
C. inverted and larger
D. upright and smaller
13. What kind of lens is used by short-sighted persons?
A. concave
B. convex
C. compound
D. cylindrical​