Prabin Kalikote

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Asked Questions

Draw a labeled diagram showing the working mechanism of the human eye.

What is magnification? Why is a camera called an optical instrument?

The ratio of the height of the image to the heightof the object is called magnification.

As we know that, theinstrument that is used to produce animage of anobject with the help of a lens, is called an optical instrument.In the same way, the camera works on the basis ofrefraction or reflection of light. So, it is called an opticalinstrument.

Define the power of the lens. Write its SI unit.

Thepower of the lens is defined as the reciprocal of its focallength in meter.
Its SI unite dioptre (D).

Draw the ray diagram for the concave lens, when the object is placed beyond 2F. Also, mention the nature and position of the image formed.

Nature: Virtual and erect
Position: Between F and O

In which conditions does the lens form an erect and enlarged image? Give the application of this condition.

When the object is placed between F and O of a convex lens, the lens forms an erect and enlarged image.

Draw the diagram of a convex lens and give the nature and position of the image formed when an object is placed.

a. at 2F

Nature: Real and inverted
Position: 2F

b. Between 2F and F

Nature: Real and inverted
Position: Beyond 2F

c. Af F

Nature: Real and inverted
Position: At infinity

d. Between F and O

Nature: Virtual and erect
Position: Beyond the object

e. Beyond 2F

Nature: Real and inverted
Position: Between F and 2F

What is focusing? Whys is focusing done?

Theprocess of adjusting thedistancebetween a lensand the screen so that the image becomes clear anddistinct is called focusing.

Focusing is done to produce a sharp and clearimage inthe camera, microscope, telescope, etc.