A 60-W light bulb emits a yellow light at a wavelength of 580 nm (1 nm...

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Question

A 60-W light bulb emits a yellow light at a wavelength of 580 nm (1 nm = 10^-9m). How many photons does the light bulb emit every second?

an apple is 30 cm away from the converging lens. The focal length of the lens is 15 cm. Where and what type of image of the apple form?

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