Optics 5 - Class

Ex 1 - If an object is located 6.0 cm in front of a lens of focal length + 10.0 cm, where will the image be formed?

• 6 cm

• • -6 cm

• -15 cm

• 15 cm

If an object is located 6.0 cm in front of a lens of focal length + 10.0 cm, what will be the maginification?

• +2.5

• -2.5

• -0.5

• 0.5

Ex 2 - An object is placed 12.0 cm in front of a diverging lens of focal length 6.0 cm. Find the image distance

• - 4 cm

• 4 cm

• -6 cm

• -12 cm

An object is placed 12.0 cm in front of a diverging lens of focal length 6.0 cm. Find the magnification.

• 1.3

• 0.3

• -0.3

• -1.3

Ex5 - A biconvex (also called a double convex) thin spherical lens has radii of 100 cm and 20.0 cm.

The lens is made of glass with an index of 1.54 and is immersed in air.

If an object is placed 70.0 cm in front of the 100-cm surface, find the focal length of the thin lens

• 30.86

• -30.86

• 35

• -35

A biconvex (also called a double convex) thin spherical lens has radii of 100 cm and 20.0 cm.

The lens is made of glass with an index of 1.54 and is immersed in air.

If an object is placed 70.0 cm in front of the 100-cm surface, find the image distance

• 55.2

• -55.2

• 35

• -35

Ex7 - A double-convex thin lens can be used as a simple “magnifier.”

It has a front surface with a radius of curvature of 20 cm and a rear surface with a radius of curvature of 15 cm. The lens material has a refractive index of 1.52.

Answer the following questions to learn more about this simple magnifying lens.

What is its focal length in air?

• 16.48

• 10.15

• 7.5

• 20.12

A double-convex thin lens can be used as a simple “magnifier.”

It has a front surface with a radius of curvature of 20 cm and a rear surface with a radius of curvature of 15 cm. The lens material has a refractive index of 1.52.

Answer the following questions to learn more about this simple magnifying lens.

What is its focal length in the water?

• 58.33

• 20.15

• 30.33

• 44.18

Ex 9 -If an object is located 6.0 cm in front of a lens of focal length + 10.0 cm, where will the image be formed?

• -15

• 15

• 6

• -6

Ex10 - An object is placed 12.0cm in front of a diverging lens of focal length 6.0 cm. Find the image.

• -4

• 4

• 6

• -6