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01. Define power of a lens.
Q2. Name any two factors on which resistance or a conductor depends.
Q3. Write one function of placenta.
Q4. What is dispersion of light?
Answers
Explanation:
power of the lens
If a lens has a shorter focal length it is said to be more powerful. The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D).
poer of lens = i / focal length
p=i/f
Converging (convex) lenses have positive focal lengths, so they also have positive power values.
Diverging (concave) lenses have negative focal lengths, so they also have negative power values.
2. The temperature of the conductor.
The cross-sectional area of the conductor.
Length of the conductor.
Nature of the material of the conductor.
3 the placenta is an organ that develops in your uterus during pregnancy. This structure provides oxygen and nutrients to your growing baby and removes waste products from your baby's blood. The placenta attaches to the wall of your uterus, and your baby's umbilical cord arises from it.
4 These colors are often observed as light passes through a triangular prism. Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet. The separation of visible light into its different colors is known as dispersion