Lens & Mirror equation

A normal human eye has a focal length of about 0.023 m. If you look at the tip of a pencil, 0.553 m from your eye, how far is the image from the lens of your eye? 

• 0.024 m
• 0.033 m
• 0.045
• 0.055

If the distance of the image from the lens (di) is positive. The image is considered....

• Real 
• Virtual

In the thin lens equation, do represents 

• Distance of the object from the lens
• Distance of the image from the lens

farsighted vision is corrected when _____ lenses allow light rays to focus on the retina

• converging
• diverging 

Why is light refracted?

• Light speeds up
• Light slows down
• Light speed stays the same
• Light can either slow down or speed up

Tags

NGSS.HS-PS4-1

a real image...

• is produced by virtual rays and can be projected on a screen
• is produced by real rays and cannot be projected on a screen
• is produced by virtual images and cannot be projected on a screen
• is produced by real rays and can be projected on a screen

If the focal length is negative a _________ lens is being used

• concave (diverging)
• convex (converging)

The velocity of light in vacuum is _______ m/s

• 3x10⁸

• 3x10¹²

• 3x10⁶

• 3x10¹⁰