Which does not contain a lens?

eyeglasses

mirror

microscope

a floodlight

Monochromatic electromagnetic radiation illuminates an area of a surface. The electric and magnetic fields of the waves are then doubled in magnitude.

Which statement about the composition of ocean and water is true? A. The composition of ocean water varies with depth B. The composition of ocean water varies with many factors C.

What is the most important safety rule to remember during lab activities

The magnetic flux that passes through one turn of a 18-turn coil of wire changes to 2.67 from 8.19 Wb in a time of 0.0386 s. The average induced current in the coil is 275 A. What is the resistance of the wire?

What is the role of MnO2 in a dry cell?

Suppose you are an observer standing on the Moon, looking back at Earth. If the moon is in the waxingquarter phase, what phase of the Earth would you see? A. waxing quarter B. full C. new D. waning quarter E. none; the Earth doesn't have phases

How many chromosomes will an elephant's sperm have?

Would the springs inside a bathroom scale be more compressed or less compressed if you weighed yourself in an elevator that was moving upward at constant velocity

tessa bought stock in a restaurant for $287.00 her stock is now worth $401.80 what is the percentage increase of the value of Tessa's stock?

Withholding Judgment on the mentally Ill is wise because It saves you from embarrassing yourself often people have disorders that don't affect you then you can try to understand what a person is experiencing all of the above