Concave Lens Focal Length Experiment Quiz

What is the primary aim of the experiment described in the video?

• To calculate the magnification of a lens

• To determine the refractive index of a lens

• To find the focal length of a concave lens

• To measure the focal length of a convex lens

Which materials are required for the lens in contact method?

• Screen, meter scale, and a prism

• Screen, illuminated wire gauze, meter scale, and a short focus convex lens

• Illuminated wire gauze, meter scale, and a concave mirror

• Screen, meter scale, and a long focus convex lens

In the lens in contact method, what is the purpose of adjusting the screen?

• To measure the distance between lenses

• To obtain a clear image of the wire gauze

• To align the lenses in a straight line

• To focus the light source

What is the initial distance between the convex lens and the wire gauze in the lens out of contact method?

• 10 cm

• 15 cm

• 20 cm

• 25 cm

How is the focal length of the concave lens determined in the lens out of contact method?

• By measuring the distance between the convex lens and the screen

• By calculating the average value of the recorded distances

• By using the initial position of the screen

• By adjusting the position of the wire gauze