Optical Tools

Optical Tools: Lenses

Clear material with at least one curved surface. It changes the direction of light.

Multiple Choice

What is a clear material with at least one curved surface called?

• window

• straight line

• lens

• refraction

Convex Len

• Thicker in the middle than on the edges

• Bends light inward toward a point called the focus

Multiple Choice

Convex lenses are thicker in the middle than on the edges.

• True

• False

Concave Lens

• Thicker at the edges than in the middle

• Bends light outward

Multiple Choice

Concave lenses are thicker in the middle than on the edges.

• True

• False

Light Enters the Eye

• Retina - Optic Nerve in the Back of the Eye

• Focus should be on the retina

• When the focus does not make it to the retina, corrective lenses can be used to fix the problem

Multiple Choice

The nerve in the back of the eye is called the retina?

• True

• False

Eyeglasses or Contact Lenses

• Farsighted (trouble seeing things close to them) - need convex lenses

Multiple Choice

When people have trouble seeing things close to them, we say they are nearsighted.

• True

• False

Eyeglasses or Contact Lenses

• Nearsighted (trouble seeing faraway) - need concave lenses

Multiple Choice

When people have trouble seeing things far away, we say they are nearsighted.

• True

• False

Scientific Tools

• Hand Lens

• Makes Small Things Look Larger

• Convex Lens

Multiple Choice

Which tool makes small things look larger using a convex lens?

• hand lens

• binoculars

• telescope

• prism

Scientific Tools

• Microscope

• Makes Tiny Objects Look Much Larger

• Both Concave and Convex

Multiple Choice

Microscopes use convex and concave lenses to make tiny objects look much larger.

• True

• False

Scientific Tools

• Binoculars

• Makes Faraway Objects Look Closer

• Convex & Concave

Multiple Choice

Binoculars use convex and concave lenses to make objects far away look closer.

• True

• False

Scientific Tools

• Telescope

• Makes Very Faraway Objects Look Many Times Closer

• Convex & Concave

Multiple Choice

Telescopes use convex and concave lenses to make very far away objects look small.

• True

• False

Scientific Tools

• Prism

• Clear object that splits white light into all the colors of the rainbow

• Works by refracting (bending light)

Multiple Choice

Prisms split white light into all the colors of the rainbow.

• True

• False

ROY G BIV

• Red, Orange, Yellow, Green, Blue, Indigo, Violet

Multiple Choice

The colors of the rainbow are white, red, pink, green, purple, and black.

• True

• False