21.For an angle greater than the critical angle ( ? c ), all the energy of the i
ID: 1731927 • Letter: 2
Question
21.For an angle greater than the critical angle ( ?c), all the energy of the incident light is
a.
Reflected
b.
Refracted.
c.
Diffracted.
22. If you stand closer to a concave mirror than a distance of one focal length, the image you see is
a.
real and inverted.
b.
real and upright.
c.
virtual and upright
23. The image of an object beneath the surface of a medium of refractive index n> 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
a.
real and closer to the viewer than the object.
b.
virtual and closer to the viewer than the object.
c.
real and farther from the viewer than the object.
24. When light is either reflected or refracted, the quantity that does not change in either process is its
a.
direction of travel.
b.
dispersion.
c.
frequency.
25. An average normal human eye cannot focus on an object closer than the near point, which is
a.
15 cm.
b.
25 cm.
c.
25 mm.
a.
Reflected
b.
Refracted.
c.
Diffracted.
Explanation / Answer
21.a
For an angle greater than the critical angle ( ?c), all the energy of the incident light is
Reflected
because the total internal reflection takes place at this condition
the other two options are not takes place
22. c
If you stand closer to a concave mirror than a distance of one focal length, the image you see is
Answer ---- virtual and upright (C)
the real and inverted image takes place if the object is in between C and F
real and upright image does not takes place
23. b
The image of an object beneath the surface of a medium of refractive index n> 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
no real image will form ofcourse closerto the viewer than the object
b. virtual and closer to the viewer than the object.
24. c
The image of an object beneath the surface of a medium of refractive index n> 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is only frequency
the other two may change by the factors but the frequency does not
answer is option c frequency
25. b
An average normal human eye cannot focus on an object closer than the near point, which is 25 cm
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