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Earn +20 ptsQ: What lens gives an enlarged and erect image?
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What does a negative 5 mean in eyesight?
The person is moderately myopic (short sighted or near sighted). The person can see things that are closer clearly but things that are far will be out of focus. The eye is bulged and the image forms in front of the retina and a concave lens with -5 power will help in forming a clearer image on the retina.
A microscope has 20 X ocular eyepiece and two objective of 10 X and 43 X respectively?
lower power= 20 x 10= 200x higher power= 20 x 43= 860x
Why does a lens with with 2 cm diameter have 4 times the light gathering power of a 1 cm lens?
Because the 2cm lens has 4 times the area of a 1cm lens. (area = Pi*r2)
Which lens is greater than 50 mm?
a greater 1
Is convex lens have a positive or negative magnification?
Positive.Positive.Positive.Positive.
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