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###### Himanshu posted an Question
May 25, 2020 • 02:01 am 30 points
• IIT JAM
• Physics (PH)

# Optics white light is reflected normally from....

1) here what question want to say no minimum between are observed. Between but among what??? 2) in second pic solution is there tell me only that why here they taken n+1 (highlighted) for minima yes it's after Maxima but they should not change condition na that is 2ut cos@= n lamda where n is 0,1,2...

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• ##### Dhairya sharma

dear I attached it's solution plz see .I hope that will help you.

• ##### Abhishek singh

This explanation will give you a new concept as well. You have to grasp this and remember it. It will help you in exam. You have to catch some keywords. Here the keyword is , "there is no minima in between". And what does it mean is mentioned in the attached. Best regards.

But you are free to ask doubts.

you may refer to Rubiii Ma'am's explanation. That is also a good explanation

• ##### Chandra prakash

see attached file dear for cleaificatoon of concept of dark and bright fringes.... this relation u want to ask is nothing but dark fringes.... bcoz of...you 9.if interfance is minimum so after this bright fringes occurs...... best regards

• ##### Ruby negi Best Answer

if n+1/2 is the Maxima then (n+1/2)+1/2 is the minima(i.e n+1) (because at n+1/2,n+3/2 ..... there is Maxima so in between n+1/2 and n+3/2 there is minima means at n+1)

This is a nice explanation!

• ##### Ruby negi

here , question is saying that there is no minima between the Maxima of first wavelength and minima of second wavelength, means after Maxima of first wavelength ,there is minima of second wavelength, that's why we took first Maxima and then just after Maxima ,there is minima of second...

• ##### Dhairya sharma

here (n+1) is due just because we want to find the widhth...... and for this we have to use n+1 nd n th condition.

for your complete clarification i attached full derivation.

in the given figure don't get confused t is the thickness of the film.

• ##### Dhairya sharma

Dear it want to say that the given wavelength are for the first maxima and for the first minima. there is no maxima and mimima between them.

see in the figure there's nothing between first maxima and minima.

i hope u will get it.

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