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General
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Hint:
In this question firstly we will solve the trigonometric equation and after eliminating the tan part. Then we will use the L'hospital theorem twice and later evaluate and put the value.
The correct answer is: 
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Elastic potential and gravitational potential energies are equal all the time.
- The main difference between gravitational potential energy and elastic potential energy is that the origin of gravitational potential energy is the gravitational forces acting between two massive bodies whereas the origin of elastic potential energy is the electrostatic forces between molecules that make up a material
- An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height. An object possesses elastic potential energy if it is at a position on an elastic medium other than the equilibrium position
Elastic potential and gravitational potential energies are equal all the time.
GeneralGeneral
- The main difference between gravitational potential energy and elastic potential energy is that the origin of gravitational potential energy is the gravitational forces acting between two massive bodies whereas the origin of elastic potential energy is the electrostatic forces between molecules that make up a material
- An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height. An object possesses elastic potential energy if it is at a position on an elastic medium other than the equilibrium position
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A ray of light is incident on an equilateral glass prism placed on a horizontal table For minimum deviation which of the following is true?

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A ray of light strikes a plane mirror at an angle of incidence 450 as shown in the figure After reflection, the ray passes through a prism of refractive index 1.50, whose apex angle is 40 The angle through which the mirror should be rotated if the total deviation of the ray is to be 900 is

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