DOUBLE CONVENX LENS
In your hand, hold the lens out as far as possible, and try to focus on the object across the room that you’ve selected. Is the object inverted or upright? Smaller or larger? Can you focus the object, or are you unable to? Slowly move the lens towards your dominant eye (or towards your eyeglasses). Describe what happens to the image as it gets close to your eye.
now the same for a DOUBLE CONCAVE LENS
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