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Question Number 181256 Answers: 0 Comments: 7

(1/f)=(n−1)((1/R_1 )−(1/R_2 )) lense′s maker equation. when is positive or negative R_1 and R_2 ?

$$\frac{\mathrm{1}}{{f}}=\left({n}−\mathrm{1}\right)\left(\frac{\mathrm{1}}{{R}_{\mathrm{1}} }−\frac{\mathrm{1}}{{R}_{\mathrm{2}} }\right)\:\:{lense}'{s}\:{maker}\:{equation}. \\ $$$${when}\:{is}\:{positive}\:{or}\:{negative}\:{R}_{\mathrm{1}} \:{and}\:\:{R}_{\mathrm{2}} ? \\ $$

Question Number 181172 Answers: 0 Comments: 2

write snell′s law that light move a concentrative medium to nonconcentrative medium and show with a shape.

$${write}\:{snell}'{s}\:{law}\:{that}\:{light}\:{move}\:{a}\: \\ $$$${concentrative}\:{medium}\:{to}\:{nonconcentrative} \\ $$$${medium}\:{and}\:{show}\:{with}\:{a}\:{shape}. \\ $$

Question Number 181171 Answers: 0 Comments: 1

prove snell′s law

$${prove}\:{snell}'{s}\:{law} \\ $$

Question Number 176966 Answers: 1 Comments: 1

Question Number 174095 Answers: 0 Comments: 0

prove the distance between object and image of glass slab.

$${prove}\:{the}\:{distance}\:{between}\:{object}\:{and} \\ $$$${image}\:{of}\:{glass}\:{slab}. \\ $$

Question Number 170721 Answers: 0 Comments: 1

Which is the true magnefication′s formula for the concave mirror? m=(f/(p−f))? m=−(f/(p−f))?

$${Which}\:{is}\:{the}\:{true}\:{magnefication}'{s}\: \\ $$$${formula}\:{for}\:{the}\:{concave}\:{mirror}? \\ $$$${m}=\frac{{f}}{{p}−{f}}? \\ $$$${m}=−\frac{{f}}{{p}−{f}}? \\ $$

Question Number 170720 Answers: 0 Comments: 0

Prove the magnefication for concave mirror. m=(f/(∣f−p∣))

$${Prove}\:{the}\:{magnefication}\:{for}\:{concave} \\ $$$${mirror}. \\ $$$${m}=\frac{{f}}{\mid{f}−{p}\mid} \\ $$

Question Number 165617 Answers: 1 Comments: 0

what is the focal length formula for combined lenses? if lenses more than tow?

$${what}\:{is}\:{the}\:{focal}\:{length}\:{formula}\:{for}\: \\ $$$${combined}\:{lenses}?\:{if}\:{lenses}\:{more}\:{than}\: \\ $$$${tow}? \\ $$

Question Number 164821 Answers: 0 Comments: 9

prove that n=((360^° )/∝)−1 n=number of multiple images

$${prove}\:{that}\:\:{n}=\frac{\mathrm{360}^{°} }{\propto}−\mathrm{1} \\ $$$${n}={number}\:{of}\:\:{multiple}\:{images}\: \\ $$

Question Number 139060 Answers: 0 Comments: 8

Question Number 137547 Answers: 0 Comments: 1

Question Number 129103 Answers: 1 Comments: 0

how is the significant figures in 132+32.67+23+566??

$${how}\:{is}\:{the}\:{significant}\:{figures}\:{in} \\ $$$$\mathrm{132}+\mathrm{32}.\mathrm{67}+\mathrm{23}+\mathrm{566}?? \\ $$

Question Number 84667 Answers: 0 Comments: 1

Question Number 69851 Answers: 0 Comments: 0

A convex mirror of radius of curvature 30cm forms a real image 20cm from its surface.Find whether the imavect is erect or inverted.Please explain how possible this is. Thanks in advance.

$${A}\:{convex}\:{mirror}\:{of}\:{radius}\:{of}\:{curvature} \\ $$$$\mathrm{30}{cm}\:{forms}\:{a}\:{real}\:{image}\:\mathrm{20}{cm}\:{from}\:{its} \\ $$$${surface}.{Find}\:{whether}\:{the}\:{imavect}\:{is} \\ $$$${erect}\:{or}\:{inverted}.{Please}\:{explain}\:{how}\: \\ $$$${possible}\:{this}\:{is}. \\ $$$$ \\ $$$${Thanks}\:{in}\:{advance}. \\ $$

Question Number 60597 Answers: 0 Comments: 3

Question Number 54357 Answers: 2 Comments: 1

Question Number 52593 Answers: 1 Comments: 1

Question Number 50453 Answers: 0 Comments: 3

Question Number 47912 Answers: 0 Comments: 0

Question Number 45610 Answers: 0 Comments: 1

Question Number 44676 Answers: 1 Comments: 6

Question Number 43596 Answers: 0 Comments: 0

Question Number 43571 Answers: 1 Comments: 0

Question Number 42475 Answers: 0 Comments: 1

A signpost 4.5cm high is 30cm away⊛ from Mrs Rahup.What is the height of the image formed in her retina?(Take the eye lens-retina distance as 1.5cm).

$${A}\:{signpost}\:\mathrm{4}.\mathrm{5}{cm}\:{high}\:{is}\:\mathrm{30}{cm}\:{away}\circledast \\ $$$${from}\:{Mrs}\:{Rahup}.{What}\:{is}\:{the} \\ $$$${height}\:{of}\:{the}\:{image}\:{formed}\:{in}\:{her} \\ $$$${retina}?\left({Take}\:{the}\:{eye}\:{lens}-{retina}\right. \\ $$$$\left.{distance}\:{as}\:\mathrm{1}.\mathrm{5}{cm}\right). \\ $$

Question Number 42025 Answers: 0 Comments: 2

A man,near point is 90cm from his eyes and his far point is 3cm. What type of eye defect has he? If he is to read a book at 25cm and see distant object clearly,what type and power of lenses will you recommend for him?

$${A}\:{man},{near}\:{point}\:{is}\:\mathrm{90}{cm}\:{from} \\ $$$${his}\:{eyes}\:{and}\:{his}\:{far}\:{point}\:{is}\:\mathrm{3}{cm}. \\ $$$${What}\:{type}\:{of}\:{eye}\:{defect}\:{has}\:{he}? \\ $$$${If}\:{he}\:{is}\:{to}\:{read}\:{a}\:{book}\:{at}\:\mathrm{25}{cm}\:{and} \\ $$$${see}\:{distant}\:{object}\:{clearly},{what}\:{type} \\ $$$${and}\:{power}\:{of}\:{lenses}\:{will}\:{you} \\ $$$${recommend}\:{for}\:{him}? \\ $$$$ \\ $$

Question Number 41906 Answers: 0 Comments: 1

A concave lens of focal length 60cm is made of material whose refractive index for red light is 1.641 and refractive index for blue light is 1.659.That for white light is 1.65.It is combined with a convex lens of dispersive power 0.0173 to form an achromatic doublet. Calculate the focal length of the achromatic lens.

$${A}\:{concave}\:{lens}\:{of}\:{focal}\:{length}\:\mathrm{60}{cm} \\ $$$${is}\:{made}\:{of}\:{material}\:{whose} \\ $$$${refractive}\:{index}\:{for}\:{red}\:{light}\:{is} \\ $$$$\mathrm{1}.\mathrm{641}\:{and}\:{refractive}\:{index}\:{for}\:{blue} \\ $$$${light}\:{is}\:\mathrm{1}.\mathrm{659}.{That}\:{for}\:{white}\:{light} \\ $$$${is}\:\mathrm{1}.\mathrm{65}.{It}\:{is}\:{combined}\:{with}\:{a}\:{convex} \\ $$$${lens}\:{of}\:{dispersive}\:{power}\:\mathrm{0}.\mathrm{0173}\:{to} \\ $$$${form}\:{an}\:{achromatic}\:{doublet}. \\ $$$${Calculate}\:{the}\:{focal}\:{length}\:{of}\:{the} \\ $$$${achromatic}\:{lens}. \\ $$

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