(a) A student has focussed the image of an object of height $3\text{ cm}$ on a white screen using a concave mirror of focal length $12\text{ cm}$ . If the distance of the object from the mirror is $18\text{ cm}$ , find the values of the following:

(i) Distance of the image from the mirror

(ii) Height of the image

OR

(b) Define power of a lens. The focal length of a lens is $-10\text{ cm}$ . Write the nature of the lens and find its power. If an object is placed at a distance of $20\text{ cm}$ from the optical centre of this lens, according to the New Cartesian Sign Convention, what will be the sign of magnification in this case?

Q: (a) A student has focussed the image of an object of height $3\text{ cm}$ on a white screen using a concave mirror of focal length $12\text{ cm}$. If the distance of the object from the mirror is $18\text{ cm}$, find the values of the following: (i) Distance of the image from the mirror (ii) Height of the image OR (b) Define power of a lens. The focal length of a lens is $-10\text{ cm}$. Write the nature of the lens and find its power. If an object is placed at a distance of $20\text{ cm}$ from the optical centre of this lens, according to the New Cartesian Sign Convention, what will be the sign of magnification in this case?

(a) (i) Distance of the image from the mirror = 12 cm (ii) Height of the image = 2 cm OR (b) Power of a lens is defined as the reciprocal of its focal length measured in metre. Power = 1/f = 1/(-0.1) = -10 D The lens is concave as the focal length is negative. Magnification = - (v/u) = - (20/-10) = -2 The sign of magnification is negative.

Q: How many marks does this question carry in CBSE Class 10 Science 2023?

This question carries 3 marks in the CBSE Class 10 Science 2023 examination.

Q: Which chapter does this question come from in Science?

This question is from the chapter "Light — Reflection and Refraction" in the CBSE Class 10 Science syllabus.

Q: What topic does this question cover in Science?

This question covers the topic "Image Formation by Spherical Mirrors" from CBSE Class 10 Science.

Q: What type of question is this in the CBSE Class 10 Science 2023 paper?

This is a Short Answer question from Section C in the CBSE Class 10 Science 2023 paper.

Question

(a) A student has focussed the image of an object of height $3\text{ cm}$ on a white screen using a concave mirror of focal length $12\text{ cm}$ . If the distance of the object from the mirror is $18\text{ cm}$ , find the values of the following:

(i) Distance of the image from the mirror

(ii) Height of the image

OR

(b) Define power of a lens. The focal length of a lens is $-10\text{ cm}$ . Write the nature of the lens and find its power. If an object is placed at a distance of $20\text{ cm}$ from the optical centre of this lens, according to the New Cartesian Sign Convention, what will be the sign of magnification in this case?

Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2023?

Which chapter does this question come from in Science?

What topic does this question cover in Science?

What type of question is this in the CBSE Class 10 Science 2023 paper?