Practice free Optics (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
When the angle of incidence is $ 60 ^\circ $ on the Surface of a glass slab, it is found that the reflected ray is completely palarised. Then the velocity of light in glass is____$ ms^{-1} $
$ Here , n = tan \theta_p = \sqrt 3 , n = {c \over \nu } $ $ \therefore v = \sqrt 3 \times 10^8 $
Which of the following phenomenon is used in optical fibres ?
Optical fibers work on the principle of total internal reflection. When light enters the fiber at a certain angle, it gets totally internally reflected within the core of the fiber, allowing it to travel long distances with minimal loss. This ensures that the light signal is transmitted efficiently from one end of the fiber to the other.
Ordinary light incident on a glass slab at the polarising angle, suffers a deviation of $ 22 ^\circ $ . The value of angle of refraction in this case is .
$ from fig \theta p + 90 ^\circ +r = 180 ^\circ $ $ \therefore \theta_p + r = 90 ^\circ and \theta p -r = 22 ^\circ $ $ \therefore r = 34 ^ \circ $
A spherical convex surface separates object and image spaces of refractive indices 1.00 and 
. If the radius of curvature of the surface is 10 cm, its power is
P=1/f
The minimum distance between a real object and screen such that a convex lens of focal length 20 cm can produce a real image on the screen is.
The minimum distance between the real object to the real image formed by the convex lens is 4f
Hence, D = 4f = 4 x 20 = 80 cm.
A concave lens of focal length 25 cm produces image the size of the object. The distance of the object from the lens is
A biconvex lens of glass has a radius of curvature 20cm. Which one of the following gives the correct position and nature of the image formed when an object is placed at 40cm from the lens?
A converging beam of light is incident on a concave lens of focal length 30cm, in such a way that their point of intersection would lie at a height 1cm above the principal axis and at a distance of 24cm from the position of the lens if there was no lens. Find the nature of the image formed when the beam passes through the lens.
One face of a prism of apex angle 30 is silvered and a ray of light is incident on the first face at an angle i such that it retraces its entire path after reflection from the silvered face. If the refractive index of prism material is 2, then the value of i must be -
A ray of light incident on an equilateral prism at grazing incidence emerges from the prism at grazing emergence. Refractive index of the prism is
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