write the formula of calculate the magnification products by spherical mirror
Answers
Answer:
-v/u is ur required answer........ ..
Answer:
us consider the convex mirror of focal length = f
The object is placed on principle axis.
Distance between object and the mirror= u
The distance between the image and the mirror = v
Using the ray diagram
Similarly,
But DE=AB and when the aperture of the mirror is very small then EF= PF
Hence, equation (ii) becomes
By looking at the diagram, PF= f; PB1=v; PB = u, PC= 2f, therefore,
Dividing the above equation (4) by uvf, we get
For a convex mirror: focal length f is always positive
∴ f >0
Since the object is on the left of the convex mirror, u<0
Using the above formula, we can conclude that v is positive if the image is at the back of the mirror. Therefore, the image is virtual whatever be the value of u.
OR
The magnification of the microscope is given by m= mome where, mo is the magnification due to objective lens and me is the magnification due to eyepiece of microscope.
Magnification of objective lens
Magnification of eyepiece
b) Given: angular magnification = 30
Focal length of eyepiece fe = 5cm
Focal length of objective fo = 1.25 cm
The image formed at least distance of vision= d= 25cm
Magnification of eyepiece me=
Magnification of objective mo = m/ me
Now using, lens makers formula,
Again, using lens maker’s formula for eyepiece,
The distance between object and eyepiece = 4.17 cm
Separation between the objective and eyepiece= 4.17+7.5 = 11.67 cm
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