Optical Devices

1. Which part of the human eye refracts rays and forms the image of an object?

• cornea

• iris

• lens

• retina

2. A camera forms an image in a sensitive film while an eye forms the image on the ___.

• cornea

• iris

• lens

• retina

3. Which statement about the parts of the eye and their uses is FALSE?

• The eyelid opens or shuts the eye.

• The iris enables the eye to see nearby objects.

• The pupil controls the intensity of the incoming light.

• The retina serves as the screen where the image is formed.

4. A farsighted person needs a convex lens as this lens can make the image fall ___.

• on the eyeball

• before the retina of the eye

• on the retina of the eye

• beyond the retina of the eye

5. What can a camera do which a human eye cannot do?

• It can form images of an object.

• It can adjust to dim and bright lights.

• It can change focus from short to long distances.

• It can give a permanent record of the scene on which it is focused.

6. Which of the following optical instruments does NOT form a real, inverted and smaller image?

• camera

• human eye

• pinhole camera

• simple microscope

7. An optical device used to see very far or distant objects clearly is the ___.

• camera

• compound microscope

• telescope

• simple microscope

8. A compound microscope is an optical system. Which statement does NOT describe it?

• It makes small objects look bigger.

• It is used to magnify distant objects clearly.

• It consists of two converging lens - an objective lens and an eyepiece.

• It has an eyepiece that enlarges the image created by the objective lens.

9. A simple microscope produces ___.

• an enlarged and real image

• an enlarged and virtual image

• an upright and real imge

• an upright and smaller image

10. Which part of the camera functions like the retina on which the image is formed?

• shutter

• film

• lens

• diaphragm