Physics Lights & Optics

Which electromagnetic waves have the highest frequencies and the shortest wavelengths?

• microwaves
• visible light
• gamma rays

The point where the rays meet is known as....

• Fire
• the focal point
• refraction
• Plane of the lens

If a light ray is shown on a plane mirror with an angle of incidence of 45 degrees, what is the angle of reflection?

• 15
• 30
• 45
• 90

Which type of lens is shown?

• Concave
• Convex
• Reflective
• Refracting

Why does green grass look green?

• It reflects all colors except green.
• It absorbs all colors except green.
• It only absorbs green.
• The colors mix to make green.

An object is placed 5 cm in front of a plane mirror, how far behind the mirror is the image of the object?

• 2.5

• 5

• 7.5

• 10

A pencil appearing to bend when it is immersed in a glass of water is an example of...

• Reflection
• Rarefaction
• Refraction
• Reconstruction

When light passes from one medium to a denser medium _________.

• it is bent towards the normal.

• it always lies along the normal.

• it is unaffected.

• it is bent away from the normal.

In a vacuum radio waves, visible light and gamma rays all have the same ________.

• frequency

• energy

• wavelength

• speed

The speed of light is:

• 300,000 km/sec

• 343 m/s

• 3.00e10 m/s

• 3,000,000 m/s