Question

List the new Cartesian sign convention for reflection of light by spherical mirror. Draw a diagram and apply these conventions for calculating the focal length and nature of spherical mirror which forms a 1/3 times imagnied virtual image of an object placed 18 cm in front of it.ORWith the help of a ray diagram, state what is meant by refraction of light. State Snell’s law for refraction of light and also express it mathematically. The refractive index of air with respect to glass is 2/3 and the refractive index of water with respect to air is 4/3. If the speed of light in glass is 2 × 10⁸ m/s, find the speed of light in (a) air, (b) water.

Answer 1

HEY MATE YOUR ANSWER IS

Cartesian Sign Convention: In the case of spherical mirror all signs are taken from Pole of the spherical mirror, which is often called origin or origin point. This sign convention is known as New Cartesian Sign Convention.

Sign is taken as + (positive) behind the spherical mirror. For example if an image is formed behind the mirror, the distance of image is taken as + (positive) from pole along the principal axis.The height of is taken as + (positive) above the principal axis and taken as – (negative) below the principal axis.

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