Complete the following table. Type of lens Position of object Nature of image Size of image convex Between optic centre and focus convex At focus concave At infinity concave At any distance

Type of lens Position of object Nature of image Size of image convex Between optic centre and focus Virtual and upright Magnified convex At focus Real and inverted Very much magnified concave At infinity Virtual and upright Highly diminished concave At any distance Virtual and upright Diminished A concave lens is thinner in the middle and thicker at the edges. A convex lens is thicker in the middle and thinner at the edges. The image formed by a concave lens is always virtual, erect and smaller than the object. The properties of the image formed by convex lens are virtual and upright. The image is greater than the object.

E M B I B E

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 13

EASY

10th ICSE

IMPORTANT

Earn 100

A lens forms a magnified, erect and virtual image of an object. Name the device which uses its principle or a device used for magnification.

Important Questions on Refraction Through a Lens

MEDIUM

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 15

Classify as real or virtual, the image of a candle flame formed on a screen by a convex lens. Draw a ray diagram to illustrate how the image is formed.

MEDIUM

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 19

Draw a ray diagram to show how a converging lens is used as a magnifying glass to observe a small object. Mark on your diagram the foci of the lens and the position of the eye.

MEDIUM

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 20

Draw a ray diagram to show how a converging lens can form an image of the Sun. Hence, give a reason for the term 'burning glass' for a converging lens used in this manner.

MEDIUM

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 25

Give two characteristics of the image formed by a concave lens.

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 26

Give two characteristics of the virtual image formed by a convex lens.

MEDIUM

10th ICSE