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Optics
The critical angle for total internal reflection at an air - water interface is approximately
48o
. In which of the following situations will total internal reflection occur.
a. light incident in water at
40o
b. light incident in water at
55o
c. light incident in air at
40o
d. light incident in air at
55o
48o
. In which of the following situations will total internal reflection occur.
a. light incident in water at
40o
b. light incident in water at
55o
c. light incident in air at
40o
d. light incident in air at
55o
Optics
Figure shows an equiconvex lens (of refractive index 1.5) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle from the lens is measured to be 45 cm. The liquid is removed and the experiment is repeated. The new distance is measured to be 30 cm. What is the refractive index of the liquid ?
http://www.onlinetestseries.in/data/images/common/papers/partners/32/1173/image001.png
http://www.onlinetestseries.in/data/images/common/papers/partners/32/1173/image001.png
Optics
In the young's double slit experiment, the intensity on the screen at a point where path difference is λ is K. What will be the intensity at the point where path difference is (λ/4) ?
(1) K/4 (2) K/2 (3) K (4) Zero
(1) K/4 (2) K/2 (3) K (4) Zero
Optics
Fig. shows the view through the eye-piece of a prism spectrometer with its slit illuminated by the source of light emitting three wavelengths corresponding to yellow (Y), green (G) and unknown colour (X). The colour X may be:
Image not present http://www.onlinetestseries.in/data/images/common/papers/partners/32/1176/image059.png
1) Red
(2) Orange
(3) Pink
(4) None of these
Image not present http://www.onlinetestseries.in/data/images/common/papers/partners/32/1176/image059.png
1) Red
(2) Orange
(3) Pink
(4) None of these
Optics
On a polarizing sheet a mixture of plane polarised and unpolarised light falls normally. On rotating the polarising sheet about the direction of the incident beam, the transmitted maximum and minimum intensities vary by a factor 4. The ratio of the intensities of polarised and unpolarised light is ?
Optics
A concave mirror of focal length 'f1' is placed at a distance of 'd' from a convex lens of focal length 'f2'. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returns to infinity. The distance 'd' must equal :
(1) 2f1 + f2
(2) –2f1 + f2
(3) f1 + f2
(4) –f1 + f2
(1) 2f1 + f2
(2) –2f1 + f2
(3) f1 + f2
(4) –f1 + f2
Optics
In YDSE,the slits are 2 mm apart and are illuminated by photons of 2 wave length 12000 Ao and 10000 Ao. At what min. Distance from the common central bright fringe on the screen 2m from the slit will a bright from one interference pattern coincide with bright fringe from other ?
Optics
A plane mirror is moving with velocity 4Ã+5j+8k. A point object in front of the mirror moves with a velocity 3Ã+4j+5k. Here k is along the normal to the plane mirror and facing towards the object. The velocity of the image is
1. -3Ã+4j+5k
2. 7Ã+9j+11k
3. 3Ã+4j+11k
4. -3Ã-4j+11k
1. -3Ã+4j+5k
2. 7Ã+9j+11k
3. 3Ã+4j+11k
4. -3Ã-4j+11k
Optics
Which of the following is NOT true of experiments involving curved mirrors?
image distance is negative for for real image
object distance is positive
image distance is negative for virtual image
focal length is negative for convex mirrors
image distance is negative for for real image
object distance is positive
image distance is negative for virtual image
focal length is negative for convex mirrors
Optics
An estimate of the refractive index of glass is 1.5. If the angle of incidence is
30o
the angle of refraction is
30o
the angle of refraction is
