Grade 9 Lens

This is a

• Converging Lens

• Diverging Lens

• Dispersing Lens

• Plane Plan

The function of this lens is to ....

• Collect rays

• Separate Rays

• Change rays colours

• Reflect rays

This lens is called ... lens.

• Convex

• Concave

• Complex

• Contact

In this diagram O and I indicate the position of object and image respectively. What is B?

• 2 x focal length

• focal length

• centre of lens

• centre of image

In this diagram O and I indicate the position of object and image respectively. Which one is focal point?

• B & C

• C & D

• C & E

• B & D

In this diagram O and I indicate the position of object and image respectively. Focal length is indicated by length ....

• B to C

• C to D

• C to E

• B to D

Which special rays in converging lens is correct?

• (1) and (4)

• (2) and (3)

• (2) only

• (3) only

In converging lens, parallel rays to the main (principal) axis is refracted to the principal focus. This ray is shown by ray number

• (1)

• (2)

• (3)

• (4)

The nature of this image is

• Diminished & closer to the lens

• Diminished & further to the lens

• Enlarged & closer to the lens

• Enlarged & further to the lens

The nature of this image is

• Diminished & closer to the lens

• Diminished & further to the lens

• Enlarged & closer to the lens

• Enlarged & further to the lens