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 25

MEDIUM

10th ICSE

IMPORTANT

Earn 100

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

Important Questions on Refraction Through a 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.

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 27

In each of the following cases, where must an object be placed in front of a convex lens so that the image formed is:

(a) at infinity,

(b) of same size as the object,

(c) inverted and enlarged,

(d) upright and enlarged image

MEDIUM

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 28

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

MEDIUM

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IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 29

State the changes in the position, size and nature of the image of an object when brought from infinity up to a convex lens. Illustrate your answer by drawing ray diagrams.

HARD

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 30

State the changes in the position, size and nature of the image of an object when brought from infinity up to a concave lens. Illustrate your answer by drawing diagrams.

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 31

When an object is placed at a distance of more than