Define critical angle.
The angle of incidence in the denser medium corresponding to which the angle of refraction in the rarer medium is... View Article
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An aluminium ring B faces an electromagnet A. The current I through A can be altered
If current through A increases, crosses (X) linked with coil B increases, hence anticlockwise current induces in coil B. As shown in figure... View Article
Total internal reflecting mirrors are preferred over plane mirrors because
Total internal reflecting mirrors are preferred over plane mirrors because a) They do not absorb any light b) They do... View Article
Total Internal Reflection occurs when:
Total internal reflection is defined as the light ray reaching an interface with a less dense medium such that the... View Article
Name the principle on which Optical Fiber works:
Optical Fibers are based on Total Internal Reflection. The phenomenon in which the angle of incidence is more than the... View Article
When light undergoes refraction, the wavelength
When light undergoes refraction, the wavelength decreases in denser medium .
When light undergoes refraction, its frequency
When light undergoes refraction, its frequency remains same.
Can absolute value of refractive index be less than unity?
Since the speed of light is maximum in vacuum, the refractive index cannot be less than unity.
Mirage is caused due to
Mirage is caused due to total Internal Reflection of light by the various layers of air. Mirage is an optical... View Article
Total Internal Reflection is based on
Total Internal Reflection is based on reflection. Total internal reflection is based on the following two conditions: The angle of... View Article
Just before setting, the sun may appear to be elliptical. This happens due to:
Refraction of light rays through the atmosphere may cause different magnifications in the mutually perpendicular directions.
A combination of two lenses with power 1D and 2D is there what is the total power
If two thin lenses of power p1 and p2 are held in contact then the power of the combination will... View Article
What is the unit of power of lens?
The unit of power of the lens is Dioptre. The power of a lens is defined as the reciprocal of... View Article
A microscope is focused on an ink mark on the top of a table. If we place a glass slab 3cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass slab is 1.5 cm.
The image of the ink spot moves up by 1cm. Refractive index = Real depth/ apparent depth 1.5 = 3/... View Article
A convex lens has a focal length of 10cm. What is the power of the lens?
Answer: Convex lens have the ability to converge a parallel beam of light into a point. This point is called... View Article
A mark is made on the bottom of a vessel, over this mark a glass slab of thickness 3.5 cm and refractive index 7/4 is placed. Now water (refractive index 4/3) is poured into the vessel so that the surface of water is 8 cm above the upper surface of the slab. Looking down normally through the water, the apparent depth of the mark below the surface of water will be
Refractive index = real depth / apparent depth. Apparent depth = {8 / (4/3)} + {3.5 / (7/4)} = 6... View Article
Right angled prisms can be used to
Right angled prisms can be used to a) Deviate a ray through 90 degree and 180 degree. b) Invert an... View Article
Which is the position of minimum deviation in prism?
When the angle of incidence is such that the refracted ray inside the prism is parallel to the base of... View Article
In a concave mirror when the object is located beyond C the magnification is
In a concave mirror when the object is located beyond C the magnification is less than one as the image... View Article
What happens to the magnifying power of microscope, when its length increases?
The magnifying power of microscope increases, when its length is increased.
