Physics test

• Reflection
• Refraction

A student placed a pencil in a cup of water.  The pencil appears broken because light-

• always travels in a straight line
• bends when it passes through water
• makes the water in the glass evaporate
• reflects the pencil on the water's surface

How is light affected by an increase in the index of refraction?

• Its frequency increases
• Its frequency decreases
• Its speed increases
• Its speed decreases

When light passes at an angle to the normal from one material into another material in which its speed is lower

• it is bent towards the normal.
• it always lies along the normal.
• it is unaffected.
• it is bent away from the normal.

The formula to calculate the refractive index is

• n=cv
• n=v/c
• n=c/v
• v=nc

Swimming pools and the ocean look shallower than they really are due to:

• reflection 
• dispersion
• refraction
• total internal reflection

Absolute refractive index of any medium is always _______.

• less than 1
• greater than 1
• 1
• 0

Students often use a hand lens to make small objects appear larger. A hand lens makes objects appear larger because the lens-

• increases the light’s strength

• changes the color of the light

• bends light passing through it

• converts light energy to heat

The distance between two crests or two troughs is the...

• Crest/Peak
• Trough
• Wavelength

A prism separating white light is an example of...

• Refraction
• Reflection