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Worksheetsray optics(review till lens makers formula)
Total questions: 11
Worksheet time: 6mins
The focal length of a converging lens are fV and fR for
violet and red light respectively. Then
fV > f R
fV = f R
fV < f R
any of the three is possible depending on the value of
the average refractive index m
Which of the following is not due to total internal reflection?
Working of optical fibre
Difference between apparent and real depth of pond
Mirage on hot summer days
Brilliance of diamond
Critical angle of light passing from glass to water is minimum for
red colour
green colour
violet colour
yellow colour
A ray of light travelling in a transparent medium of refractive index , falls on a surface separating the medium from air at an angle of incidence of 45°. For which of the following value of the ray can undergo total internal reflection?
refractive index =1.33
refractive index =1.40
refractive index =1.50
refractive index =1.25
A glass lens is immersed in water. What will be the effect on the focal length of lens?
increases
decreases
remains constant
answer does not depend upon the medium
Light of wavelength 6000 Å falls on plane mirror. The wavelength of reflected light
increase
decreases
remains constant
data is not sufficient to answer
an air bubble inside water behaves as
converging lens
Diverging lens
An equiconvex lens of focal length 12 cm is cut into two halves as shown in figure. Find the focal length of each part?
-24 cm
24 cm
12 cm
-12 cm
The line A & B in the ray diagram of figure represent a _______________ lens.
converging
Diverging
If refractive index of water is 4/3 and that of glass is 3/2 ,then refractive index of water w.r.t. glass is 9/8.
True
False
Find the nature of lens Ab in the diagram given above
Diverging
converging
