optical instruments

An optical instrument used for magnification has power 25 D of objective and 20 D of eyepiece. Whether it is a microscope or a telescope?

• Microscope

• Telescope

The eyepiece of an astronomical telescope has a focal length of 10 cm. The telescope is focused for normal vision of distant objects when the tube length is 1 m. The focal length of the objective is:

• 20 cm

• 10 cm

• 90 cm

• 100 cm

The magnifying power of an astronomical telescope is 8 and the distance between the two lenses is 54 cm. The focal length of eye lens and objective lens will be respectively:

• 6 cm and 48 cm

• 48 cm and 6 cm

• 8 cm and 64 cm

• 64 cm and 8 cm

Finger prints are observed by the use of :

• Telescope

• Microscope

• Newtonian telescope

• Concave lens

The magnification produced by the objective lens and the eye lens of a compound microscope are 25 and 6 respectively. The magnifying power of this microscope is:

• 19

• 31

• 150

• 120

A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power is 100. The magnifying power of the other lens is:

• 10

• 20

• 50

• 25

Some of discoveries made by my lenses were: irregularity of the Moon’s surface and the four largest Jupiter’s moons.

Who am I?

• Telescope

• Microscope

• Binoculars

I am a simple manual optical instrument that students use in Science class to be able to observe small things they don't see well such as insects in the garden. Who am I?

• Glasses

• Camera

• Magnifying glass

Without my lenses, scientists would never be able to find out about the Sun and the Solar system.

Who am I?

• Camera

• Magnifyng glass

• Telescope

I have lenses that help children to see better. Who am I?

• Camera

• Magnifyng glass

• Glasses

Tags

NGSS.MS-PS4-2