Light

Objects that emit their own light are called ______.

Which of the following use bioluminescence.

• Firefly

• Candle

• Dinoflagellates

• Giant Siphonophore

• Caterpillar

Bioluminescence is used by animals for:

• Attracting prey

• To look good

• To ward away danger

• To illuminate their dinner

The moon is ____.

• Transparent

• Explosive

• Full of pizzas

• Opaque

• Translucent

Select the correct spelling

• Rectilinnear propogtoion of litgh

• Rectillinear propogation of light

• Rectilinear propagation of light

• Rectelinear propagation of light

The moon appears bright due to ______.

• reflection

• refraction

• scattering

• luminousity

There are 3 types of lunar eclipses.

• True

• False

The consequences of rectilinear propagation of light are:

• scattering of light; occurance of eclipses

• bioluminescence; formation of shadows

• scattering of light; formation of shadows

• formation of shadows; occurance of eclipses

The speed of light is:

• $3\times10^8$ m/s

• $3\times10^9\$ m/s

• $3\times10^7$ m/s

• $3\times10^8$ km/s

If I=size of image, O=size of object, v=image distance, u=object distance 

The ratio of magnification is:

•  $Magnification\ =\ \frac{I}{O}$ 

•  $Magnification\ =\ \frac{O}{\pi}$ 

•  $Magnification\ =\ \frac{O}{I}$ 

•  $Magnification\ =\frac{v}{u}$