PHYSICS WORKSHEET-1

Complete the ray diagram showing the image formation of the object.

How will the position and intensity of the image be affected if the lower half of the mirror's reflecting surface is painted black?

How does focal length of a lens change when red light incident on it is replaced by violet light? Give reason for your answer.

Define power of a lens. Write its units. Deduce the relation 1/f = 1/f1 +1/f 2 for two thin lenses kept in contact coaxially.

A convex lens of focal length 25 cm is placed coaxially in contact with a concave lens of focal length 20 cm. Determine the power of the combination. Will the system be converging or diverging in nature?

A thin convex lens having two surfaces of radii of curvature R1 and R2 is made of a material of refractive index 2. It is kept in a medium of refractive index 1. Derive, with the help of a ray diagram, the lens maker formula when a point object placed on the principal axis in front of the radius of curvature R1 produces an image I on the other side of the lens.

A biconvex lens made of a transparent material of refractive index 1.25 is immersed in water of refractive index 1.33. Will the lens behave as a converging lens? Give reason

A converging lens of refractive index 15 is kept in a liquid medium having same refractive index. What would be the focal length of the lens in this medium?

Draw a plot showing the variation of power of a lens with the wavelength of the incident light. A diverging lens of refractive index 15 and of focal length 20 cm in air has the same radii of curvature for both sides. If it is immersed in a liquid of refractive index 17, calculate the focal length of the lens in the liquid.

With the help of a suitable ray diagram, derive the mirror formula for a concave mirror.