Could I please have some help with these questions?

1.

A beam of light in air is incident at an angle of 35 to the surface of a rectangular block of clear plastic (n = 1.49). What is the angle of refraction?

Round your answer to the nearest whole number.

2.

A convex mirror has a focal length of 15 cm. If the object is 35 cm from the mirror and is 2 cm tall, what is the magnification?

Round your answer to one decimal place.

3.

A film projector produces a 1.51 m tall image of a horse on a screen. If the projector lens is 4.00 m from the screen and the size of the horse on the film is 1.07 cm, what is the magnitude of the magnification of the image?

Round your answer to the nearest whole number.

4.

What is the critical angle for light emerging from carbon disulfide into air? The index of refraction for carbon disulfide is 1.632.

Round your answer to one decimal place.

5.

A concave mirror has a focal length of 15 cm. If the object is 35 cm from the mirror, what is the image distance?

Round your answer to one decimal place.

6.

An object is placed 20.0 cm from a thin converging lens along the principal axis of the lens. If a real image forms behind the lens at a distance of 8.00 cm from the lens, what is the focal length of the lens?

Round your answer to one decimal place.

7.

The returning of light to the first medium from the boundary between the two media is called

Refraction

Diffraction

Dispersion

Reflection

Thank u!