Spring tides occur when the moon is either new or full, and the sun, the moon, and the Earth are aligned. ... neap tide- A tide in which the difference between high and low tide is the least. Neap tides occur twice a month when the sun and moon are at right angles to the Earth.
Answer: It wouldn't be as modern as today is we would be back to using oil and other things from back then there wouldn't be cars everything would be less machined.
Answer:
The lenses with different focal length are four.
Explanation:
Given that,
Radius of curvature R₁= 4
Radius of curvature R₂ = 8
We know ,
Refractive index of glass = 1.6
When, R₁= 4, R₂ = 8
We need to calculate the focal length of the lens
Using formula of focal length
![\dfrac{1}{f}=(n-1)(\dfrac{1}{R_{1}}+\dfrac{1}{R_{2}})](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7Bf%7D%3D%28n-1%29%28%5Cdfrac%7B1%7D%7BR_%7B1%7D%7D%2B%5Cdfrac%7B1%7D%7BR_%7B2%7D%7D%29)
Put the value into the formula
![\dfrac{1}{f}=(1.6-1)(\dfrac{1}{4}+\dfrac{1}{8})](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7Bf%7D%3D%281.6-1%29%28%5Cdfrac%7B1%7D%7B4%7D%2B%5Cdfrac%7B1%7D%7B8%7D%29)
![\dfrac{1}{f}=\dfrac{9}{40}](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7Bf%7D%3D%5Cdfrac%7B9%7D%7B40%7D)
![f=4.44\ cm](https://tex.z-dn.net/?f=f%3D4.44%5C%20cm)
When , R₁= -4, R₂ = 8
Put the value into the formula
![\dfrac{1}{f}=(1.6-1)(\dfrac{1}{-4}+\dfrac{1}{8})](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7Bf%7D%3D%281.6-1%29%28%5Cdfrac%7B1%7D%7B-4%7D%2B%5Cdfrac%7B1%7D%7B8%7D%29)
![\dfrac{1}{f}=-\dfrac{3}{40}](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7Bf%7D%3D-%5Cdfrac%7B3%7D%7B40%7D)
![f=-13.33\ cm](https://tex.z-dn.net/?f=f%3D-13.33%5C%20cm)
When , R₁= 4, R₂ = -8
Put the value into the formula
![\dfrac{1}{f}=(1.6-1)(\dfrac{1}{4}-\dfrac{1}{8})](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7Bf%7D%3D%281.6-1%29%28%5Cdfrac%7B1%7D%7B4%7D-%5Cdfrac%7B1%7D%7B8%7D%29)
![\dfrac{1}{f}=\dfrac{3}{40}](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7Bf%7D%3D%5Cdfrac%7B3%7D%7B40%7D)
![f=13.33\ cm](https://tex.z-dn.net/?f=f%3D13.33%5C%20cm)
When , R₁= -4, R₂ = -8
Put the value into the formula
![\dfrac{1}{f}=(1.6-1)(\dfrac{1}{-4}-\dfrac{1}{8})](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7Bf%7D%3D%281.6-1%29%28%5Cdfrac%7B1%7D%7B-4%7D-%5Cdfrac%7B1%7D%7B8%7D%29)
![\dfrac{1}{f}=-\dfrac{9}{40}](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7Bf%7D%3D-%5Cdfrac%7B9%7D%7B40%7D)
![f=-4.44\ cm](https://tex.z-dn.net/?f=f%3D-4.44%5C%20cm)
Hence, The lenses with different focal length are four.
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Answer: Heat will transfer from the water to the air. When a mass of air moves on a warmer surface it is heated by its base. Then thermal instability develops in the lower layers and then extends upwards. If the air initially contained inversions, these are destroyed and a strong gradient is established uniformly in the lower troposphere temperature.