Lakhmir Singh and Manjit Kaur Solutions for Chapter: Refraction of Light, Exercise 30: Questions Based on High Order Thinking Skills (HOTS)

A camera fitted with a lens of focal length $50 \mathrm{mm}$ is being used to photograph a flower that is $5 \mathrm{cm}$ in a diameter. The flower is placed $20 \mathrm{cm}$ in front of the camera lens.

At what distance from the film should the lens be adjusted to obtain a sharp image of the flower?

A camera fitted with a lens of focal length $50 \mathrm{mm}$ is being used to photograph a flower that is $5 \mathrm{cm}$ in a diameter. The flower is placed $20 \mathrm{cm}$ in front of the camera lens.

What would be the diameter of the image of the flower on the film?

A camera fitted with a lens of focal length $50 \mathrm{mm}$ is being used to photograph a flower that is $5 \mathrm{cm}$ in a diameter. The flower is placed $20 \mathrm{cm}$ in front of the camera lens.

What is the nature of the camera lens?

An object is $2 \mathrm{m}$ from a lens which forms an erect image one-fourth (exactly) the size of the object. Determine the focal length of the lens. What type of lens is this?

An image formed on a screen is three times the size of the object. The object and screen are $80 \mathrm{cm}$ apart when the image is sharply focused.

(a) State which type of lens is used.

(b) Calculate focal length of the lens.