Exponent and powers class 7 Evaluate?? ll Maths #shorts #youtubeshorts #exponentandpower

Try this. Make a list of students in your class using spectacles. Record the power of their lenses. Find out and note which type of defect of vision they suffer from. Which defect is most common among the students?

Express each of the following as power of a rational number with positive exponent : (1/4)^(-3) (ii) 5^(-3)\ x\ 5^(-6) (c) ((-1)/4)^(-5)x\ ((-1)/4)^(-7)

Out of 180 students in a class 7 students failed in all the three subjects viz. Physics, Chemistry, Maths only 144 students pass in only one subject and 21 students pass in only two subjects. How many students passed in atleast two subjects?

Out of 180 students in a class 7 students failed in all the three subjects viz. Physics, Chemistry, Maths only 144 students pass in only one subject and 21 students pass in only two subjects. How many students passed in at most two subjects but atleast in one subject?

Find the optical power and the focal lengths (a) of a thin glass lens in liquid with refractive index n_(0) = 1.7 if its optical power in air is Phi_(0) = 5.0 D , (b) of a thin symmetrical biconvex glass lens, with air on one side and water on the other side, if the optical power of that lens in air is Phi_(0) = + 10D .