I have three science questions i don't understand. i need fast help. please! thanks.?

1.A curved piece of glass or other transparent material that is used to refract light is call a(n)


a. mirror


b. lens


c. reflector


d. optical fiber





2. Because the light rays never meet, a concave lens can produce


a. no image


b.both real and virtual images


c.only a real image.


d.only a virtual image





3. what happens when white light strikes a black object?


a.blue light is reflected


b.red light is reflected


c.no light is reflected


d.all of the light is reflected

I have three science questions i don't understand. i need fast help. please! thanks.?
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