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Physics calculating wavelength

sorry, I'm using the phone.

When asked to calculate the value for wavelength of light shone through slits, I was given the following values;
slit separation: 5x10^-4m
Distance to screen: 2.5m
the fringe separation on the screen was 24mm

when I used the normal equation for wavelength my final value was 4.8x10-6
but the book answer is 4.8x10-7 I have checked but cannot see where I went wrong.

Anyone please help?
Sorry you've not had any responses about this. :frown: Are you sure you've posted in the right place? :smile: Here's a link to our subject forum which should help get you more responses if you post there. :redface:

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