Optics: Convex Lens

What happens to the size of image when the object is moved from infinity towards the optical centre of the lens?

• The size of the image remains same

• The size of the image reduces

• The size of the image increases gradually

What would be the nature of image when the object lies in between 2F₁ and F₁?

• Real , Erect and Enlarged

• Real, inverted and Enlarged

• Virtual, inverted and diminished

On what factor does the size of an image formed by a lens depend?

• It depends on the position of an object from the lens.

• It depends on the brightness in the room

At what position Object should be place so that its size and image are same size?

• At 2F₁

• At F₁

• Between 2F₁ and F₁

You are provided with two convex lenses of same aperture and different thickness. Which one of them will be of shorter focal length?

• Thick convex lens will have shorter focal length than that of thin convex lens.

• Thick convex lens will have longer focal length than that of thin convex lens.

What is the nature of an image formed by a convex lens for a distant object ( at infinity)?

• Real, inverted and highly diminished

• Real, inverted and of same size

• Real, inverted and Enlarge

Study the following ray diagrams drawn by four students to locate the position of the image formed by a convex lens when the object is placed at 2F_1. Please choose the correct answer

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• 
• 
• 

Name the point on the principal axis of a convex lens where the ray of light passing through it does not suffer any deviation.

• Optical centre ‘O’

• principal axis

• Focal length

• Principal focus

An object is placed on the left side of a lens at a distance of 20 cm. The focal length of the lens is 10 cm. Where is image formed?

• Right side- 20 cm from optical centre

• Right side- 10 cm from optical centre

• The image is at principal focus of the lens

• The image is bigger than the object

• The image is inverted