G8 Mid-term review

Which position is the image of the top of the object formed?

• A

• B

• C

• D

What's the angle of incidence?

• 55

• 70

• 35

• 110

Which letter represents the focal length?

• X

• Y

Which statement about real image (实像) is always correct?

• It is nearer to the lens than the object.

• It is upright.

• It is on the opposite side of the lens to the object.

• It is the same size as the object.

Which one is the angle of reflection?

• P

• Q

• R

• S

1 is yellow, 2 is green, what is 3's color?

• red

• violet

• blue

• black

The focal length is 2cm, the object is 3cm in front of the lens. What's the image formed by this lens?

• larger

• inverted

• further from the lens than the object

• virtual

what are the characteristics of the image formed by mirror?

• same size as the object

• real

• virtual

• larger

Which type of waves are used in medical scanning?

• visible light

• X-rays

• microwaves

• ultrviolet

Which type of waves used in the remote controller?

• infrared

• X-rays

• visible light

• gammer ray